unmentionable
adjective
[ ʌnˈmɛnʃ(ə)nəb(ə)l ]
• too embarrassing, offensive, or shocking to be spoken about.
• "the unmentionable subject of incontinence"
Similar:
taboo,
censored,
forbidden,
banned,
interdicted,
proscribed,
prohibited,
not to be spoken of,
ineffable,
unspeakable,
unutterable,
unprintable,
indescribable,
out of bounds,
beyond the pale,
off limits,
that dare not speak its name,
disapproved of,
frowned on,
offensive,
embarrassing,
shocking,
indecent,
indecorous,
rude,
immodest,
impolite,
scandalous,
disgraceful,
appalling,
shameful,
obscene,
filthy,
no go,
unmentionable
noun
• a person or thing that is too shocking or embarrassing to be mentioned by name.
• "wearing nothing but fig leaves over their unmentionables"