hit-or-miss

from WordNet (r) 3.0 (2006)

hit-or-miss
    adj 1: dependent upon or characterized by chance; "a haphazard
           plan of action"; "his judgment is rather hit-or-miss"
           [syn: {haphazard}, {hit-or-miss}]

from The Collaborative International Dictionary of English v.0.48

hit-or-miss \hit-or-miss\ adj.
   performed without care or close attention; slipshod;
   careless; -- of the manner of performing a task. Opposite of
   {careful}, {conscientious} or {methodical}.

   Syn: haphazard, slapdash, slipshod, sloppy.
        [WordNet 1.5]