"regardless" in the adjective sense
1. careless, regardless
usually followed by `of') without due thought or consideration
"careless of the consequences"
"crushing the blooms with regardless tread"
"regardless" in the adverb sense
1. regardless, irrespective, disregardless, no matter, disregarding
in spite of everything without regard to drawbacks
"he carried on regardless of the difficulties"
Source: WordNet® (An amazing lexical database of English)
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