Irregardless

//ˌɪɹɪˈɡɑːdlɪs// adj

Definitions

Adjective
  1. 1
    Irrespective, regardless. humorous, nonstandard, not-comparable, proscribed, sometimes

    "Dear loved ones were unceremoniously hurried off home, irregardless to any previous arrangement, where they could sit down and recount the incidents of the trip to those who had been left behind, and where they were welcomed with the hearty greeting, "Home again.""

Adverb
  1. 1
    regardless; a combination of irrespective and regardless sometimes used humorously wordnet

Etymology

Probably a blend of irrespective + regardless; the word can also be analysed as ir- + regardless because it is possible that the prefix ir- was added to amplify the negative in regardless just as plain negatives often did at the time the word came into use (and still do in dialects).

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