1. (adverb)careless(p), regardless (usually followed by `of') without due thought or consideration Antonyms: attentive, paying attention, thoughtful, heedful
2. (adverb)regardless, irrespective, disregardless, no matter, disregarding in spite of everything; without regard to drawbacks Synonyms: irrespective, regardless, no matter, disregardless, disregarding Antonyms: paying attention, attentive, heedful, thoughtful