Breadcrumb Home > Thesaurus > U Synonyms of unmentionable Find synonyms for: Noun 1. undergarment, unmentionable, garment usage: a garment worn under other garments Adjective 1. unmentionable, impermissible (vs. permissible) usage: unsuitable or forbidden as a topic of conversation; "unmentionable words" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of unmentionable (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: felicitous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language