They were an incompatible pair and could never see eye to eye.
terrible fit
Frequency:
70
%
Their relationship was a terrible fit from the beginning.
poor match
Frequency:
60
%
It was clear they were a poor match after their first date.
mismatched duo
Frequency:
50
%
As a mismatched duo, they struggled to find common ground.
Idiomatic Expressions for bad match
Phrase: make a bad match
Meaning: to pair or combine two things that do not work well together
Usage: Mixing those two colors would make a bad match for the room's decor.