See inattentive in Webster's New World Roget's A-Z Thesaurus II
adjective
So lost in thought as to be unaware of one's surroundings:
absent, absent-minded, abstracted, bemused, distrait, faraway, preoccupied. Idiom: a million miles away. See ability, awarenessLacking or marked by a lack of care:
careless, feckless, heedless, irresponsible, reckless, thoughtless, unconcerned, unmindful, unthinking. See careful
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