Definition of irregardless in English:

irregardless

adverb & adjective

informal
  • Regardless.

    ‘the photographer always says, irregardless of how his subjects are feeling, ‘Smile!’’
    • ‘And if you do that, then irregardless of who wins, you've done your civic duty.’
    • ‘Use words correctly, irregardless of how others use them.’
    • ‘The recommendation is to treat, to ensure patient comfort irregardless of the proper diagnosis being made.’
    • ‘Is the user expected to open the files irregardless of warnings?’
    • ‘This bill will give all couples the same legal rights irregardless of their sexual orientation or marital status.’
    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
    View synonyms

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/