IPA: /ɪnˈkɒŋɡruəsnəs/
KK: /ɪnˈkɒŋɡruəsnəs/
The quality of being out of place or not fitting in; a lack of harmony or agreement between things.
The incongruousness of the modern building in the historic district surprised many visitors.
Incongruousness → It is formed from "in-" (meaning not), "congruere" (meaning to agree or fit together), and "-ness" (meaning the state of being). The word describes the state of not fitting together or being out of harmony.
Think of 'not' fitting together ('in-' means not, and 'congruere' means to agree) — that's why incongruousness refers to a lack of harmony.