Someone or something that is incongruous seems strange when considered together with other aspects of a situation. She was small and fragile and looked incongruous in an army uniform + incongruously in·con·gru·ous·ly buildings perched incongruously in a high green valley. strange, unexpected, or unsuitable in a particular situation
lacking in harmony or compatibility or appropriateness; "a plan incongruous with reason"; "incongruous behavior"; "a joke that was incongruous with polite conversation"
Not congruous; reciprocally disagreeing; not capable of harmonizing or readily assimilating; inharmonious; inappropriate; unsuitable; not fitting; inconsistent; improper; as, an incongruous remark; incongruous behavior, action, dress, etc