What does unmentionable mean?
Unmentionable describes something considered too sensitive, embarrassing, improper, or socially forbidden to discuss. Its adjective use is common in formal and political contexts: a topic may be unmentionable because naming it could cause offence, damage a relationship, or breach an accepted taboo. The noun, especially in the phrase “the unmentionable,” turns that silence into a thing: a subject that society or a particular community refuses to acknowledge. Although the word is often used deliberately rather than literally, it retains a somewhat old-fashioned, euphemistic tone. Its force comes from the contrast with ordinary mention: instead of merely describing something difficult to discuss, it suggests that the subject is not fit for discussion at all. This makes the word useful for discussing censorship, social conventions, private trauma, and the limits of public language, although it can sound evasive when applied too broadly.
Too sensitive, embarrassing, improper, or socially forbidden to mention.
"The committee avoided any unmentionable details about the case."
Often used in formal discussion of taboo subjects, private matters, or matters that powerful institutions prefer not to acknowledge.
A subject, fact, or matter that cannot or should not be mentioned or openly acknowledged.
"For years, the family treated the incident as the great unmentionable."
Frequently appears with the definite article and in the set phrase “the great unmentionable.”
The plural is used when referring to several distinct subjects or matters that cannot or should not be openly discussed.
"The agreement deliberately left several political unmentionables unresolved."
From Victorian euphemism to political shorthand, “unmentionable” gives a name to the things powerful enough to be denied a name.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unmentionable come from?
Unmentionable was formed in English during the nineteenth century by adding the prefix un- to mentionable, which combines mention with the suffix -able. Mention ultimately comes from Latin mentionem and mentio, derived from mentiri, meaning “to mention,” which is related to mens, meaning “mind.” Other English words associated with this root include mention, mentionable, mental, and mentor.
Related word forms
How unmentionable is actually used
The word is formal to literary and often deliberately euphemistic. It can imply that a subject is prohibited or socially taboo, not merely that discussing it is difficult. It was also widely used in Victorian and early twentieth-century English for sexual matters considered unsuitable for open discussion.
Easily confused with unmentionable
Unspeakable can mean literally unable to speak or too awful to describe, whereas unmentionable specifically suggests that something is forbidden, inappropriate, or too sensitive to discuss.
Unutterable often emphasizes the inability to express something in words or its extreme nature, while unmentionable usually points to social prohibition or deliberate avoidance.