Synonyms of unmentionable in English:

unmentionable


See definition of unmentionable

adjective

1‘sex was the unmentionable subject’

SYNONYMS
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
informal no go