streaky

Short definition from Wiktionary

Adjective

1. 1
   Having streaks.
2. 2
   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.
3. 3
   Unpredictable, variable; having periods of good and bad (e.g. weather).
4. 4
   Having alternating periods of good and bad performances; inconsistent.
5. 5
   Having periods of irritation or bad temper.
6. 6
   Not well-executed, due to luck more than skill.