an official order that something must not be done

official forbiddance

do not

ban, forbiddance

an ability to use more nuclear bombs than would be necessary; exaggerated behaviour

extravagant; beyond normal limits

expensive

extravagant; beyond normal limits

the act of prohibiting; a law or order that bans something

ban, forbiddance

forbidden; (an expression, word, object, act that is forbidden because of) a religious or social reason for strong disapproval

not allowed, permitted

not authorized

not sanctioned, permitted

so bad etc that it must not be spoken of

unspeakable

(the) most extreme; greatest possible

extreme, maximum