Definition of irregardless in US English:


adjective & adverb

  • Regardless.

    • ‘This bill will give all couples the same legal rights irregardless of their sexual orientation or marital status.’
    • ‘Use words correctly, irregardless of how others use them.’
    • ‘And if you do that, then irregardless of who wins, you've done your civic duty.’
    • ‘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.’
    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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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’


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