aimless

desultory erratic frivolous haphazard indiscriminate pointless random

accidental any which way bits and pieces blind capricious careless casual chance directionless drifting fanciful fickle fits and starts flighty fortuitous goalless heedless hit-or-miss indecisive irresolute objectless purposeless shiftless stray thoughtless unavailing undirected unguided unplanned unpredictable vagrant wandering wanton wayward

definite methodical particular sensible specific systematic

determined directed goal-oriented motivated pointed purposeful resolute