The unmentionableness of the scandal hung over the town like a storm cloud.

The unmentionability of his past created an invisible barrier between him and his friends.

They avoided the unmentionable topic throughout the meeting.

The unmentionable at the center of the family portrait hung like a shadow over every holiday.

She quickly shoved the unmentionables into the drawer whenever guests arrived.

She blushed unmentionably when asked about the secret.