hit-or-miss

Her occasional sketches are hit-or-miss, best when they have some sly subtext.

It probes around more or less hit-or-miss until it locates something, somewhere, that looks habitable.

We had made a wise choice, though on a hit-or-miss formula, and we were content.

He told his stories with a hit-or-miss air, as if accustomed to people of rapid apprehension.

He enjoyed life and wasted no time on trivial worries, hit-or-miss, the keynote to his thought.

A competitive game which is easy to manage is hit-or-miss illustrating.