1 synonym for Unmentionable

prohibited, forbidden, banned, restricted, off-limits, illicit, imperible, unacceptable, outlawed, proscribed, disallowed, interdicted, unmentionable, unspeakable, untouchable, censored, frowned upon, no-go, verboten, contraband, non-permissible, vetoed, shunned, ostracized, off-bounds, out of bounds, impermissible [x]