Something that's incongruous is inconsistent or incompatible with something else. Remember that Sesame Street song "One of these things is not like the other"? They were talking about that one thing being incongruous.

If we break it down into its Latin roots, incongruous is formed by adding in, meaning “not," to congruous, which means “suitable, proper.” So, something that is incongruous is "not suitable or proper" — in other words, not in harmony with everything else. That's why burping at the dinner table could be called incongruous behavior: it's not proper and certainly doesn't go well with the main course.

Definitions of incongruous

adj lacking in harmony or compatibility or appropriateness

“a plan incongruous with reason”
incongruous behavior”
“a joke that was incongruous with polite conversation”
discrepant, inconsistent
not in agreement
inappropriate, incompatible, out or keeping, unfitting
not in keeping with what is correct or proper
lacking in harmony of parts
ironic, ironical
characterized by often poignant difference or incongruity between what is expected and what actually is
congruent, congruous
corresponding in character or kind
suitable for a particular person or place or condition etc
suitable and fitting
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