Synonyms of 'fly in the ointment'
▷ See fly
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A drawback is an aspect of something or someone that makes them less acceptable than they would otherwise be.
The only drawback was that the apartment was too small.
A hitch is a slight problem or difficulty which causes a short delay.
The five-hour operation went without a hitch.
Thesaurus for fly in the ointment from the Collins English Thesaurus