adj. 25B6; adjective
an unthinking woman : THOUGHTLESS, inconsiderate, insensitive; tactless, undiplomatic, indiscreet.
an unthinking remark : ABSENT-MINDED, heedless, thoughtless, careless, injudicious, imprudent, unwise, foolish, reckless, rash, precipitate; involuntary, inadvertent, unintentional, spontaneous, impulsive, unpremeditated.
thoughtful, intentional.