1. too embarrassing, offensive, or shocking to be spoken about

1. underwear or undergarments
Usage: euphemistic; dated

Examples

• The scandal was so terrible that it became unmentionable in polite society.
• His behavior at the party was absolutely unmentionable.
• The family never spoke of the unmentionable tragedy that occurred years ago.
• She packed her unmentionables in a separate suitcase.
• The Victorian era had strict rules about discussing unmentionables.
• The topic remained unmentionable for decades after the incident.
• Mother always referred to underwear as unmentionables.