incongruity
mismatch or lack of fit
Roots
- com-: with, together, complete, or intensified
- gru / congru: fit, agree, or come together
- im- / in- (not): not or without
Other words with the gru / congru root
- congruent: matching or fitting together
- incongruous: not fitting with its surroundings or situation
Incongruity is the mismatch itself: the parts do not belong comfortably together.
The passage turned on the incongruity between her calm words and frantic actions.
Congruent gives the fitting image. Incongruity is what happens when that fit breaks: tone, behavior, evidence, or setting does not match.