The Oxford Thesaurus An A-Z Dictionary of Synonyms - regardlessadj.

1) Sometimes, regardless of. despite, notwithstanding; in spite of, heedless of, Non-Standard irregardless: Regardless of her father's protestations, she continued to go out with William. --adv. 2) notwithstanding, nevertheless, no matter what, in any event, in any case, at all events, anyway, anyhow, Non-Standard irregardless: She heard his threats but is going out with William regardless.