See unthinking in Webster's New World Roget's A-Z Thesaurus II
adjective
Lacking or marked by a lack of care:
careless, feckless, heedless, inattentive, irresponsible, reckless, thoughtless, unconcerned, unmindful. See carefulShowing no concern, attention, or regard:
careless, forgetful, heedless, mindless, unconcerned, unheeding, unmindful, unobservant. See carefulDevoid of consideration for others' feelings:
disregardful, inconsiderate, thoughtless, unthoughtful. See careful, courtesy
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