modified
aimless, accidental, casual, random, chance, offhand, careless, slipshod, incidental, unexpected, unthinking, unconscious, uncoordinated, slovenly, reckless, unconcerned, unpremeditated, loose, indiscriminate, unsystematic, unrestricted, unselected, irregular, motley, multifarious, blind, purposeless, unplanned, chaotic, hit-or-miss, devil-may-care*, willy-nilly*, what-the-hell*; see also aimless, random.
Antonyms careful, studied, planned. See syn. study at random.random.