The adjective incongruous means someone or something that is different or peculiar from what is around or from what is generally happening.
Synonyms are absurd, bizarre, incoherent, or inappropriate.
The word origins from Latin (1610s) incongruus meaning “incongruous, inconsistent”. It comes from in– meaning “not, opposite of, without” plus congruus meaning “fit, suitable”.
His joke was incongruous with the polite conversation.
The plan was incongruous with reason so it failed.
The result of the photo shoot seemed incongruous.