I think that remark is insensitive.

Involuntary muscles are muscles that move without us being conscious of them.

This material is a nonconductor and does not conduct electricity.

He was late for the game and lost by default.

His team won the game by default because the opponent didn't show up.

There was discord between them.

That painting is incongruous with the room's decoration.

An irregular galaxy is a type of galaxy that does not have a definite shape.

His music skillfully uses dissonance.

He remained silent and didn't say anything.