adj. 25B6; adjective
I'm so sorryhow thoughtless of me : INCONSIDERATE, uncaring, insensitive, uncharitable, unkind, tactless, undiplomatic, indiscreet, careless.
a few minutes of thoughtless pleasure : UNTHINKING, heedless, careless, unmindful, absent-minded, injudicious, ill-advised, ill-considered, imprudent, unwise, foolish, silly, stupid, reckless, rash, precipitate, negligent, neglectful, remiss.
considerate, careful.