hit or miss
[adjective]
Synonyms: random, aimless, designless, desultory, haphazard, indiscriminate, irregular, unaimed, unconsidered, unplanned

[TahlilGaran] English Synonym Dictionary ▲

ˌhit-and-ˈmiss (also ˌhit-or-ˈmiss) adjective
done in a way that is not planned or organized ⇒ random:
The campaign was rather a hit-and-miss affair.

[TahlilGaran] Dictionary of Contemporary English ▲

hit or miss
hit and/or miss
if something is hit and miss, you cannot be certain of its quality because it is sometimes good and sometimes bad.
We used a cheap printer, but the quality was a bit hit or miss.

Weather forecasting used to be a very hit-and-miss affair.

not planned carefully and as likely to be bad as to be good.
Hiring has often been hit or miss – we never really knew whether a person was qualified until after they started working here.

[TahlilGaran] English Idioms Dictionary ▲

hit or miss
adv. In an unplanned or uncontrolled way; aimlessly; carelessly.
George didn't know which house on the street was Jane's, so he began ringing doorbells hit or miss.

[TahlilGaran] English Idioms Dictionary ▲

hit or miss
adj. Unplanned; uncontrolled; aimless; careless.
John did a lot of hit-or-miss reading, some of it about taxes.
Mary packed her bag in hurried, hit-or-miss fashion.

[TahlilGaran] English Idioms Dictionary ▲