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English definition of “unmentionable”

unmentionable

adjective uk   /ʌnˈmen.ʃən.ə.bl̩/ us  
shocking and embarrassing and therefore not allowed or disapproved of as a subject of conversation: What's the matter with him - or is it some unmentionable disease that he doesn't like people to know about?Saddening, shocking and upsetting
(Definition of unmentionable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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