(a.) Not considered or attended to; not regarded; inconsiderable; trifling.

abandoned aimless automatic brash casual deserted designless desultory disregarded gut half-done haphazard hasty hit-or-miss hotheaded ignored ill-advised ill-considered ill-contrived ill-devised ill-gauged ill-judged imageless impolitic imprudent inadvertent inadvisable incautious inconsequent inconsequential inconsiderable inconsiderate indeliberate indiscreet indiscriminate inexpedient injudicious insensate involuntary irrational laid aside left undone mindless misadvised misguided missed myopic neglected omitted overlooked paltry passed by passed over passed up picayune pigeonholed promiscuous puny put aside reasonless reckless reflex reflexive senseless shortsighted shunted sidelined sidetracked slighted small snap spontaneous thoughtless trifling trivial unadvised unasked unattended to uncalculated uncared-for unchaperoned unconceived unconceptualized unconscious undeliberate undeliberated undescried undesigned undiscerning undone undreamed-of unexamined unexplored unforeseeing unheeded unimaged unimagined unintended unintentional unmarked unmeditated unminded unmissed unnoted unnoticed unobserved unperceived unplanned unpremeditated unreasonable unreflecting unreflective unregarded unremarked unscanned unsearched unseeing unseen unsensible unsifted unsolicited unsound unstudied untended unthinking unthought-of unthoughtful unwatched unweighed unwilled unwise witless