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impulsive, unwise, rash.
fatuous, heedless, vacuous, empty-headed, blank, unoccupied, inane, rude, unreasonable, vacant, mindless, careless, brainless, thoughtless, illogical, unthoughtful.
irresponsible, ill-considered, feckless, unreflective, inattentive, lumpish, unthinkingly, hasty, inconsiderate, careful, thoughtlessly, heedless, unconcerned, forgetful, unobservant, courtesy, foolish, undiscriminating, disregardful, reckless, unthoughtful, unheeding, careless, unmindful, detached, thoughtless, unaffectionate, uncaring, impetuous, lumpen, shallow, stupid.
There are no classes such as you have in mind in the Church, even though a few unthinking members seem to imply it by their actions; but there is no real class distinction in the Church of Jesus Christ of Latter- day Saints, only such that are based on the doing of the right and the wrong. - "Dorian", Nephi Anderson.
But still, there's a gulf between extreme probability and absolute certainty that's a bit wider than the unthinking reckon for. - "Ravensdene Court", J. S. (Joseph Smith) Fletcher.
Nominally, that is to say in the eyes of unthinking men, the North will conquer the South; but your existing armies will not do it. - "Who Goes There?", Blackwood Ketcham Benson.
unthinkingly, untiring, unthankful, unthinkable, unthinkably, untrusting, untempting, untangling.