Has Irregardless Always Been a Word?

"Irregardless means not regardless. ... Other dictionaries, including Webster's New World College Dictionary, The American Heritage Dictionary of the English Language and the Cambridge Dictionary all recognize irregardless as a word.

Is it correct to say irregardless?

So "irregardless" is a word. It has a specific use, in particular dialects. That said, it's not part of standard English and so — especially if you're writing or if you're speaking in formal places — you want to use "regardless" instead.

Is irregardless formal?

Irregardless is found in most dictionaries. It is listed as a nonstandard word, meaning it doesn't conform to grammar standards and isn't generally used by educated native speakers of English.