This is the social signaling aspect of language at work, not the communication part.
Human brains can trivially digest the correct meaning of “irregardless”. Using the word, however, marks someone as not having had a “proper” education, and would perhaps brand the speaker as “stupid”, “irregardless” of whether the idea they were expressing was intelligent or not.
It can also understand the meaning of "iregardles", "ireggardless" and "irregardlless". Is that really a sufficient condition for the word to be considered correct?
How so? Surely those who say `regardless', the vast majority, are not trying to signal anything.
One might argue that 'stupid' was originally intended to describe a person of low intelligence and because words aren't sentient, it's a misuse of the word.
It seems like a stupid argument to make, though.
Which has the same definition as inflammable.
This has always been inconceivable in my mind.
I hate English.
English spelling, and etymology are fascinating and closely related. English spelling often retains the original spelling despite changes in pronunciation.
Inflammable come directly from the Latin where “in” is not a negation but putting something “in” a state of being, in this case flame.
However, both its grammar and spelling is incredibly ad-hoc. To someone who is a fan of structure (such as a programmer like myself), this is frustrating. I was going to make a comparison to a programming language, but I came to the conclusion that there isn't really a programming language out there that absorbs everything without making it natural in the adopted framework.
Like you, I learned English as a second language and even though I can speak it reasonably well, I'm constantly annoyed by its idiosyncrasies.
An accident of history: the printing press and the first dictionaries started arriving and codifying spelling just before the shift occurred:
So “flammable” is born and people start using it and thinking the original form is opposite.
But inflammable materials are dangerous to treat otherwise! Since no one confuses “flammable” for inert, for safety reasons, the word “flammable” is used when labeling inflammable material.
The Simpsons made a joke about it once with Dr. Nik.