having or showing no regard; heedless; unmindful (often fol. by of ).

without concern as to advice, warning, hardship, etc.; anyway

I must make the decision regardless.

regardless of

in spite of; without regard for

They'll do it regardless of the cost.

adjective

attentive , concerned , heedful

adverb

irregardless

adjective

behindhand , blind , careless , coarse , crude , deaf , delinquent , derelict , disregarding , heedless , inadvertent , inattentive , inconsiderate , insensitive , lax , listless , mindless , neglectful , negligent , nonobservant , rash , reckless , remiss , rude , slack , unfeeling , unheeding , uninterested , unmindfulnotes:regardless is already a negative \'without regard to; despite\' - and irregardless is a redundant negative

adverb

against , although , anyway , aside from , at any cost , but , come what may , despite , distinct from , for all that , in any case , in spite of everything , leaving aside , nevertheless , no matter what , nonetheless , notwithstanding , without considering , without regard tonotes:regardless is already a negative \'without regard to; despite\' - and irregardless is a redundant negative , anyhow , careless , inattentive , indifferent , irrespective , neglectful , negligent , unconcerned , willy nilly