must not
Is not allowed
Must not expresses prohibition or strong negative obligation: You must not touch the artwork, Visitors must not feed the animals.
It differs from "don't have to," which merely removes obligation.
Must not means something is forbidden or essential to avoid.
The contraction mustn't sounds formal or British to American ears.
- cannotLacks the ability
- disallowRefuse to permit
- proscribeOfficially forbid something
- don'tContraction forbidding action
- forbiddenNot allowed
prohibition · verboten · impermissible · off limits · shouldn't · taboo · no go · interdiction · unlawful · against the rules · unacceptable · veto · under no circumstances · banned · never · wrong · illegal · negation
must notmust
Obligatory requirement
required · mandatory · compulsory · obligatory · imperative
must notmust
Obligatory requirement
must be · surely · definitely · undoubtedly · necessarily
not, must, musty, musts, mustn't, mustiness, mustier, mustiest