Why do flammable and inflammable mean the same thing?!

It's so irritating!

Like bruh wtf!

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Flammable:

capable of being set on fire and of burning quickly

Inflammable:

capable of being set on fire and of burning quickly

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I LITERALLY JUST SEARCHED THIS UP ON MERRIAM WEBSTER. I MEAN I KNEW BEFORE BUT I WANTED TO ADD THIS FOR PROOF.

I SWEAR SOCIETY STAYS BLOWING MY LIFFFFFEEEEEEEEE!