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.

He is active as the chief information officer of our company.

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.

Even though he is a doctor, he doesn't take care of his own health. It's truly a case of 'physician, heal thyself'.