Synonyms: impermissible
Definition: not permitted
Usage: impermissible behavior
Similar words: out, prohibited, proscribed, verboten, forbidden, taboo, tabu
Definition: excluded from use or mention
Usage: forbidden fruit; in our house dancing and playing cards were out; a taboo subject
Similar words: unmentionable
Definition: unsuitable or forbidden as a topic of conversation
Usage: unmentionable words
Similar words: untouchable
Definition: forbidden to the touch
Usage: in most museums such articles are untouchable
Synonyms: impermissible
Definition: not allowable