Irregardless is the most argued-over word in English that nobody is actually confused by. Everyone who hears it knows it means regardless. The fight is over whether it's allowed.

The dictionaries' answer, as checked in October 2026, is consistent. Merriam-Webster, Cambridge and American Heritage all list it, and all three label it nonstandard. That's the honest verdict: a real word, with a long record and a stable meaning, that sits outside the standard written language.

Its record is longer than its critics expect. Merriam-Webster's usage guide dates it to the late 18th century; the entry's first known use for this sense is 1847. It took off in the United States in the early 1900s, which is where American Heritage places its coinage. The most likely origin is a blend: irrespective crossed with regardless, so the ir- hitches a ride from one word into the other.

That stray prefix is the whole complaint. Regardless already has its negative in -less, so ir- looks like a second negative that should cancel the first. In practice it doesn't; speakers use it as a slightly emphatic regardless, and Merriam-Webster notes it is used with a consistent meaning.

What dictionaries add is a warning. Merriam-Webster says plainly that a definition is not an endorsement, and advises using regardless if you want to avoid criticism. American Heritage reports that copyeditors almost always change it, and that 90 percent of its Usage Panel rejected it in 2012.

So: say it if you like, at the kitchen table or in a text. In an essay, a cover letter or a report, write regardless. Nobody will ever circle that one.