Antonyms of adj regardless

1 sense of regardless

Sense 1
careless (predicate), regardless -- ((usually followed by `of') without due thought or consideration; "careless of the consequences"; "crushing the blooms with regardless tread")

INDIRECT (VIA heedless) -> heedful, attentive, thoughtful, paying attention -- (taking heed; giving close and thoughtful attention; "heedful of the warnings"; "so heedful a writer"; "heedful of what they were doing")

Similarity of adj regardless

1 sense of regardless

Sense 1
careless (predicate), regardless -- ((usually followed by `of') without due thought or consideration; "careless of the consequences"; "crushing the blooms with regardless tread")
       => heedless (vs. heedful), unheeding -- (marked by or paying little heed or attention; "We have always known that heedless self-interest was bad morals; we know now that it is bad economics"--Franklin D. Roosevelt; "heedless of danger"; "heedless of the child's crying")

Synonyms of adv regardless

1 sense of regardless

Sense 1
regardless, irrespective, disregardless, no matter, disregarding -- (in spite of everything; without regard to drawbacks; "he carried on regardless of the difficulties")