this post was submitted on 28 Apr 2026
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For example, "flammable" and "inflammable" both describe an object that can easily catch on fire. I can also think of "ceased" and "deceased", both of which can mean someone or something has been brought to an end.

edit: Some people are including words that can also mean its opposite (like sanction or table), those are cool too! The more weird words, the better!

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[–] scoste@discuss.tchncs.de 55 points 3 days ago (1 children)

Up and down

“Are you up for that?” “Yeah, I’m down”

"Are you down for that?" "Yeah, I'm up"

[–] insomniac_lemon@lemmy.cafe 48 points 3 days ago* (last edited 3 days ago) (3 children)

Dust. Dust the shelf, dust the loaf with flour.

Well, this is the opposite thing (same word meaning opposite) but if you ask me it's the same.

EDIT: For some that fit better:

  • thaw / unthaw
  • terminate / exterminate
  • valuable / invaluable
  • caregiver / caretaker
[–] CubitOom@infosec.pub 15 points 3 days ago (2 children)

I think valuable / invaluable actually have different meanings. Something which is invaluable, is so important a value should not be assigned.

[–] Tollana1234567@lemmy.today 7 points 3 days ago (1 children)

invaluable would be equivalent to priceless.

[–] LostCarcosan@lemmy.today 2 points 2 days ago

Priceless and worthless mean the same

Don't @ me

[–] XeroxCool@lemmy.world 2 points 2 days ago

Valuable member of society

Invaluable member of society

Neither case leads to a tangible valuation of the member as both have positive meanings. Invaluable is sort of like valuable+1, but both are just invaluable superlatives.

[–] Bonifratz@piefed.zip 9 points 3 days ago

Caregiver/caretaker is a fun one I had never considered.

[–] Beacon@fedia.io 13 points 3 days ago

That's called a contronym, which (as you said) is different than what OP is looking for

https://en.wikipedia.org/wiki/Contronym

[–] inb4_FoundTheVegan@lemmy.world 30 points 3 days ago (1 children)

"flammable" and "inflammable" both describe an object that can easily catch on fire.

WHAT A COUNTRY!

[–] MajorMajormajormajor@lemmy.ca 15 points 3 days ago

Hi Dr.Nick!

[–] fireweed@lemmy.world 33 points 3 days ago* (last edited 3 days ago) (13 children)

Two examples where erroneous usage has resulted in this paradox:

  • Regardless and irregardless

  • "I couldn't care less" and "I could care less"

[–] ArgumentativeMonotheist@lemmy.world 15 points 3 days ago (3 children)

I don't think either were ever said by competently literate people (wtf is "irregardless"? And do they mean they could "care less" about a subject or do they mean the opposite but don't understand negation?) so idk if this fits what OP was saying entirely. They're just obvious mistakes that have been normalized as people got dumber, right?

[–] TORFdot0@lemmy.world 9 points 3 days ago (1 children)

Irregardless means “without a lack of regard”. Ergo vis-à-vis if you say irregardless you are actually fully regarded

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[–] UnspecificGravity@piefed.social 25 points 3 days ago (4 children)

Literally means either literally or figuratively, and context doesn't really help.

[–] 1D10@lemmy.world 17 points 3 days ago (2 children)

Literally literally means figuratively, or literally, however figuratively literally only means figuratively.

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[–] a_gee_dizzle@lemmy.ca 2 points 2 days ago

I think the word 'unironically' has started to fill the void left behind after the word 'literally' was changed to mean 'figuratively'

[–] corsicanguppy@lemmy.ca 4 points 3 days ago* (last edited 2 days ago)

Really, it's a way to spot a bad dictionary.

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[–] Klear@quokk.au 18 points 3 days ago (2 children)

This is kinda the opposite to what you are asking: awesome and awful used to mean the same thing IIRC, both being something filling you with awe. Later the meanings split between positive and negative.

Same with terrible and terrific.

[–] mimavox@piefed.social 6 points 3 days ago (2 children)

As a non-native English speaker, I always have to think a second extra about "terrific", about it being negative or positive. Probably because it sound similar to "terrible".

[–] Okokimup@lemmy.world 4 points 3 days ago

Or as an analog: horror - terror, horrific - terrific.

[–] Beacon@fedia.io 3 points 3 days ago

You're right to think that, because that's how both words began!

https://www.etymonline.com/word/terrific

[–] Korhaka@sopuli.xyz 6 points 3 days ago (1 children)

I often thought awful was an odd word. Surely awful = full of awe, but it is frequently used to describe things that have little to no awe.

Also I have now said the word awe too much and it looks strange.

[–] Beacon@fedia.io 3 points 3 days ago

My guess is it came about because people were using it to mean "something so bad it fills you with awe". Like "the thing humans are doing to the environment are awful". But then it lost its connection to awe.

That's my guess.

[–] ignirtoq@feddit.online 23 points 3 days ago (3 children)

To bone and to debone both mean to remove bones from something, typically food.

[–] pruwybn@discuss.tchncs.de 7 points 3 days ago (1 children)

Similarly, peel and unpeel.

[–] Okokimup@lemmy.world 5 points 3 days ago (1 children)

Hulled means either the hull is still present or has been removed.

[–] Beacon@fedia.io 4 points 3 days ago

Unpitted DO have pits, and pitted have NO pits.

Sounds so backwards. The problem is they're referring to the verb of the word "pit", meaning "removing the pit". So "unpitted" means "not removing the pit". So dumb.

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[–] chunes@lemmy.world 16 points 3 days ago (1 children)

Near miss and near hit both mean a close call.

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[–] cropsec@lemmy.dbzer0.com 19 points 3 days ago (3 children)
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[–] Pappabosley@lemmy.world 5 points 2 days ago
[–] clag@lemmy.dbzer0.com 5 points 2 days ago

For Australians, yeah, yeah nah, yeah yeah nah, nah, nah yeah nah, nah nah yeah, all have subtly different positive and/or negative meanings, often dependent on the situation.

[–] jtrek@startrek.website 14 points 3 days ago (1 children)

Sanction can mean a punishment or an authorization.

Came up in a DND game where a devil's contract said the players crossing the region would be sanctioned, or something like that. Players thought it meant they had permission, fine print said they would be punished.

[–] Sualtam@lemmus.org 9 points 3 days ago

It means authorized decision. The decision can be a punishment.

[–] chunes@lemmy.world 14 points 3 days ago (1 children)

One that sorta works:

it's all uphill / downhill from here -> it's only going to get worse

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[–] ryathal@sh.itjust.works 3 points 2 days ago

Ravel and unravel can both mean to take apart something that was knitted or woven.

[–] BuboScandiacus@mander.xyz 8 points 3 days ago* (last edited 3 days ago)

In French there is personne (someone) and personne (no one), plus (more) and plus (no more)

[–] ThatGuy46475@lemmy.world 13 points 3 days ago (3 children)

One way mirror and two way mirror

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[–] EndlessNightmare@reddthat.com 7 points 3 days ago

Not the original question you asked, but fits in with your edit:

Priceless and worthless are opposites

[–] Grail@multiverse.soulism.net 8 points 3 days ago

The undead are dead.

[–] GalacticSushi@piefed.blahaj.zone 9 points 3 days ago (6 children)

Garnish can either be an enhancing addition such as in a dish, or to take something away such as garnishing wages.

You can lease/rent something to a tenant... Or you can lease/rent something from someone.

The informal definition of "literally" is an exaggeration of something that is not literally true. Inn other words, figuratively.

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[–] vividspecter@aussie.zone 8 points 3 days ago* (last edited 3 days ago) (3 children)

Slightly different, but single words meaning multiple conflicting things seem to come to mind more readily:

  • Drop meaning both to abandon or release a product
  • Table meaning both put something aside or putting up for discussion
  • Literally meaning both literal and figurative
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[–] EndOfLine@lemmy.world 7 points 3 days ago (1 children)
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[–] TropicalDingdong@lemmy.world 6 points 3 days ago

I literally can't believe this thread.

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