motiveless

aimless designless desultory drifting empty feckless floundering fustian goalless good-for-nothing haphazard hit-or-miss indiscriminate irregular meaningless needless nonsensical pointless purportless random senseless uncalled for undirected unhelpful unnecessary unplanned unprofitable unpurposed vacuous wanton worthless

decided deliberate determined planned purposeful significant useful

arbitrary gratuitous needless senseless unjust unjustifiable unjustified unprovoked vicious willful

contrary double-crossing evil mean

accidentally on purpose groundless inconsiderate malevolent merciless ornery perverse spiteful unasked uncalled-for unfair wayward wicked

needed rational reasonable

careful clean decent gentle kind moral nice observant righteous thoughtful wise