"Pretty" as an adverb

idioms dialects formality

How correct/common/proper is "pretty" as an adverb? It is hard for me to see, since it's my native dialect, but I say "pretty often" pretty often, and "fairly often" fairly rarely. Does "pretty" mark me as informal or uneducated or rustic?


Solution 1:

The NOAD reports that pretty used as adverb is informal, and it means to a moderately high degree, fairly: he looked pretty fit for his age.

Solution 2:

It's informal, but correct. The Cambridge dictionary lists an adverb form.

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