adjective 1.having or showing no
regard; heedless; unmindful (often followed by
of ).
adverb 2.without concern as to advice, warning, hardship, etc.; anyway:
I must make the decision regardless.
Idioms 3.regardless of, in spite of; without regard for: They'll do it regardless of the cost.
Related forms re·gard·less·ly, adverb
re·gard·less·ness, noun
Synonyms
1. inattentive, negligent, neglectful, indifferent, unconcerned.
Antonyms
1. attentive, mindful.