adverb
Used with a verb, adjective, or adverb to say no, that something is false, or that something does not happen.
She is not ready.
I do not understand.
Good to know
With most ordinary verbs, use do, does, or did before not: I do not agree, not I not agree.
Common phrases & grammar
subject + be + not + adjective/noun
subject + do/does/did + not + base verb