What is adverb of negation?

An adverb of negation is an adverb that makes a verb or another adverb negative in meaning. The most common adverbs that negate are 'not' and 'never'. Examples:

I will go with you. Or, I will not go with you.

I enjoy hiking. Or, I never enjoy hiking.

We rarely go out to eat.

I scarcely passed that test.

He almost hit that parked car.