It is common in informal speech and writing but is neither rare nor wrong in serious discourse. There are 20 meanings listed in oed's entry for the word pretty, four of which are labelled obsolete We can use pretty as an adverb, before an adjective or another adverb, meaning ‘quite, but not extremely’
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… that's a pretty hat you're wearing
The sofa was covered in very pretty flowery material
She's got such a pretty daughter She looked pretty in a simple cotton dress. Something or someone that is pretty is pleasing to the eye But calling someone pretty isn’t quite the same as calling them beautiful, handsome, or lovely.
When particularly stressed, the adverb pretty serves almost to diminish the adjective or adverb that it modifies, by emphasizing that there are greater levels of intensity. Find 447 different ways to say pretty, along with antonyms, related words, and example sentences at thesaurus.com.
