congruous

adjective
UK /ˈkɒŋ.ɡru.əs/
US /ˈkɑːŋ.ɡru.əs/

Something that fits well with something else.

The bright curtains are congruous with the cheerful room.


OTHER MEANINGS

2. In agreement or harmony with something.

Her calm voice was congruous with the peaceful setting.

3. In mathematics, exactly the same in shape and size.

The two triangles are congruous because their sides match.

4. Reasonable and sensible in a particular situation.

His apology was congruous with the mistake he made.