hit-and-miss

listen to the pronunciation of hit-and-miss
English - English
inconsistent, unpredictable, sometimes succeeding and sometimes failing

His choice of jokes is rather hit-and-miss.

random, arbitrary; sometimes succeeding and sometimes failing
done in a way that is not planned or organized random
If something is hit and miss or hit or miss, it is sometimes successful and sometimes not. Farming can be very much a hit-and-miss affair