streaky

adjective6

1. •
   Having streaks.
2. •
   Unpredictable, variable; having periods of good and bad (e.g. weather).

   • […] to do his duty in the face of uncommonly streaky weather like a man. — 1870
3. •
   (US, Canada) Having alternating periods of good and bad performances; inconsistent.

   • Jones has always been a streaky hitter
4. •
   Used to describe a shot where the ball deflects off the edge of the bat, but is not caught by the slips or wicket-keeper and instead results in runs for the batsman.

   • ...rather than hitting it with the middle of the bat, I jagged it off the inside edge and French-cut it over the top of the stumps for another four. That was the only streaky shot I can remember. — 2005
5. •
   Not well-executed, due to luck more than skill.
6. •
   (slang, no longer used) Having periods of irritation or bad temper.