かなり

かなり means "quite", "pretty" or "considerably": more than you would expect, short of extreme. It is an adverb and goes straight before the adjective or verb it modifies.

Before a noun, かなり takes の and means "a good deal of".

With a verb or a time

Before a verb, かなり often gives an amount rather than a degree: how far, how much, how long. It does the same before a word for time.

かなり or とても

とても gives the speaker's impression: "very". かなり sounds more like an assessment, a degree beyond the ordinary. とても has no noun form, so "a lot of" before a noun is かなりの.

• × とてもの人が来た → かなりの人が来た