The Use of "Quite"

The word “quite” is what we call an adverbial modifier, meaning it modifies the verb immediately after it, to create nuance in the meaning.  However, it is used differently in British English, and American English.

In American English, “quite” functions almost like a superlative.  When an American says, “She is quite pretty”, what he means is that she is absolutely gorgeous.

In British English, “quite” functions like a dampener of the verb.  When an Englishman says, “She is quite pretty”, what he means is probably that he is surprised she looks vaguely pleasant.

This essentially sums up the historical relationship between Americans, and the English.  One side of the Atlantic is overwhelmingly enthusiastic.  The other side is mildly amused.