hit-and-miss

hit and miss

adjective Sometimes good or successful, sometimes not; having mixed or unpredictable results; random, aimless, careless, or haphazard. Often hyphenated. Films at the festival were hit and miss, but they were all unique. The company still relies on hit-and-miss techniques that seem antiquated by today's standards. The tour around the region felt a bit hit and miss, with no clear agenda or plan.
See also: and, hit, miss
Farlex Dictionary of Idioms.

ˌhit-and-ˈmiss

(also ˌhit-or-ˈmiss less frequent) not done in a careful or planned way and therefore not likely to be successful: The advertisements were rather hit-and-miss and not based on proper market research. They use rather hit-and-miss techniques for selecting new staff.
Farlex Partner Idioms Dictionary
See also:
  • hit and miss
  • hit or miss
  • in demand
  • bleeding edge
  • whop
  • whopping
  • Molly whop (one)
  • Molly whop someone
  • Mother Nature
  • muckety muck