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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[–] ryathal@sh.itjust.works 3 points 16 hours ago

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

[–] Pappabosley@lemmy.world 5 points 19 hours ago
[–] clag@lemmy.dbzer0.com 5 points 20 hours 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.

[–] Klear@quokk.au 18 points 1 day 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 1 day 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 1 day ago

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

[–] Beacon@fedia.io 3 points 1 day 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 1 day 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 1 day 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.

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

Up and down

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

[–] TwigletSparkle@lemmy.blahaj.zone 4 points 20 hours ago

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

[–] insomniac_lemon@lemmy.cafe 48 points 1 day ago* (last edited 1 day 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
[–] Bonifratz@piefed.zip 9 points 1 day ago

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

[–] CubitOom@infosec.pub 15 points 1 day ago (2 children)

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

[–] XeroxCool@lemmy.world 2 points 20 hours 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.

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

invaluable would be equivalent to priceless.

[–] LostCarcosan@lemmy.today 2 points 16 hours ago

Priceless and worthless mean the same

Don't @ me

[–] Beacon@fedia.io 13 points 1 day ago

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

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

[–] UnspecificGravity@piefed.social 26 points 1 day ago (4 children)

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

[–] a_gee_dizzle@lemmy.ca 2 points 16 hours ago

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

[–] SqueakySpider@lemmy.dbzer0.com 1 points 16 hours ago* (last edited 16 hours ago)

And it's been like that for decades! I only learned this recently. https://en.wikipedia.org/wiki/Literally?

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

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

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[–] corsicanguppy@lemmy.ca 4 points 1 day ago* (last edited 20 hours ago)

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

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

Near miss and near hit both mean a close call.

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[–] inb4_FoundTheVegan@lemmy.world 31 points 1 day ago (1 children)

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

WHAT A COUNTRY!

[–] MajorMajormajormajor@lemmy.ca 15 points 1 day ago

Hi Dr.Nick!

[–] ignirtoq@feddit.online 23 points 1 day ago (3 children)

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

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

Similarly, peel and unpeel.

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

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

[–] Beacon@fedia.io 4 points 1 day 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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[–] fireweed@lemmy.world 33 points 1 day ago* (last edited 1 day 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 1 day 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 1 day 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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[–] BuboScandiacus@mander.xyz 8 points 1 day ago* (last edited 1 day ago)

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

[–] cropsec@lemmy.dbzer0.com 19 points 1 day ago (3 children)
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[–] jtrek@startrek.website 14 points 1 day 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 1 day ago

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

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

One that sorta works:

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

[–] TwigletSparkle@lemmy.blahaj.zone 1 points 19 hours ago

not really; "it's all downhill from here" means that the hardest part is behind you, and progress will be easier from here

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

Priceless and worthless are opposites

[–] ThatGuy46475@lemmy.world 13 points 1 day ago (3 children)

One way mirror and two way mirror

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[–] Grail@multiverse.soulism.net 8 points 1 day ago

The undead are dead.

[–] unmagical@lemmy.ml 10 points 1 day ago

Antiautonym is what you're looking for.

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