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Commonly Misused Words
"Irregardless is a word that many mistakenly believe to be correct usage in formal style, when in fact it is used chiefly in nonstandard speech or casual writing." Probably a blend of irrespective and regardless, irregardless "has been considered a blunder for decades and will probably continue to be so."
SOURCE: American Heritage Dictionaries' 100 Words Almost Everyone Confuses & Misuses