The sudden disappearance of the plane remains a mystery.

I expressed my disapproval of their decision.

I disapprove of his behavior.

He received a dishonorable discharge from the military.

The teacher's disciple was eager to learn all he could.

Discipline is the key to success.

I decided to disconnect from social media for a while.

He tried to discredit my findings with false information.

It is important to treat everyone equally and not discriminate based on their race or gender.

He brought disgrace upon his family with his actions.