Incongruous

/ɪnˈkɑːŋɡruəs/ adjective medium

Out of place; not fitting with its surroundings or with what would normally be expected.

The bright orange sneakers looked incongruous with his formal black suit.

Memory Trick

'In-' (not) plus 'congruous' (matching, as in geometry's 'congruent' shapes) — incongruous things simply don't line up.