It is common in informal speech and writing but is neither rare nor wrong in serious discourse. Some common synonyms of pretty are beautiful, comely, fair, handsome, and lovely 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. Pretty nails is a popular nail salon known for its excellent customer service and skilled staff Many customers appreciate the friendly atmosphere created by the husband and wife team, making everyone feel welcomed and valued. If you describe someone as pretty, you mean that they are attractive
She's a very charming and very pretty girl.
There are 20 meanings listed in oed's entry for the word pretty, four of which are labelled obsolete See ‘meaning & use’ for definitions, usage, and quotation evidence. Attractive to look at usually in a simple or delicate way used especially of a girl or woman Pleasant to look at or listen to