Definition of irregardless in English:

irregardless

adjective & adverb

informal
  • Regardless.

    • ‘Use words correctly, irregardless of how others use them.’
    • ‘This bill will give all couples the same legal rights irregardless of their sexual orientation or marital status.’
    • ‘Is the user expected to open the files irregardless of warnings?’
    • ‘The recommendation is to treat, to ensure patient comfort irregardless of the proper diagnosis being made.’
    • ‘And if you do that, then irregardless of who wins, you've done your civic duty.’
    anyway, anyhow, in any case, nevertheless, nonetheless, notwithstanding, despite everything, in spite of everything, for all that, after everything, no matter what, even so, just the same, all the same, be that as it may, in any event, come what may, rain or shine, come rain or shine, whatever the cost
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Usage

Irregardless is widely heard, perhaps arising under the influence of such perfectly correct forms as irrespective, but should be avoided by careful users of English. Use regardless to mean ‘without regard or consideration for’ or ‘nevertheless’

Origin

Mid 19th century: probably a blend of irrespective and regardless.

Pronunciation

irregardless

/ˌirəˈɡärdləs//ˌɪrəˈɡɑrdləs/