must not English

Meaning must not meaning

What does must not mean?

— Used to indicate that something is forbidden.

What other words have the same or similar meaning as must not?

should not do not cannot will not ought not not be allowed not may not lest don’t

How do I use must not in a sentence?

Seeing that you're not surprised, I think you must have known.

You must not take advantage of her innocence.

You must be careful not to make him angry.

And then to abandone Richard who she loved. How hard it must be not to die. Take it easy, ma'am.

must | not