Synonyms for Regardless (same or very similar meaning)
WordNet sense 1 ((usually followed by `of') without due thought or consideration):
carelessWordNet sense 2 (marked by or paying little heed or attention):
heedless, unheedingWordNet sense 3 (in spite of everything; without regard to drawbacks):
irrespective, disregarding, disregardless, no matterFrom the ODE community, based on WordNetadd/edit