Definition of irregardless in English:

irregardless

adjective & adverb

informal
  • Regardless:

    ‘the photographer always says, irregardless of how his subjects are feeling, ‘Smile!’’
    • ‘Is the user expected to open the files irregardless of warnings?’
    • ‘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.’
    • ‘This bill will give all couples the same legal rights irregardless of their sexual orientation or marital status.’
    • ‘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, whatever the cost
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Usage

Irregardless means the same as regardless, but the negative prefix ir- merely duplicates the suffix -less, and is unnecessary. The word dates back to the 19th century, but is regarded as incorrect in standard English

Origin

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

Pronunciation:

irregardless

/ˌɪrɪˈɡɑːdləs/