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unmentionable

adjective
 
 
/ʌnˈmen.ʃən.ə.bl̩/

Definition

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 adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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