Not congruous; incapable of reciprocally fitting and agreeing; unsuited or unsuitable; inharmonious.Consisting of inappropriate parts, or of parts not fitly put together; disjointed: as, an incongruous story.Synonyms Inconsistent, etc. (see incompatible), unsuitable, unsuited, unfit, inappropriate, ill-matched, out of keeping.In the theory of numbers, not congruent: thus, 7 and 8 are incongruous to the modulus 3, giving different remainders when divided by the modulus.