A. use quick/ pretty/ rather/ fairly + adjective or adverbs (e.g. It’s fairly cold)
A1. Quite/ pretty/ rather / fairly = less than very but more than a little

B. Pretty is an informal word and is used mainly in spoken English
B1. Quite goes before a/an (e.g. Ann has quite a good job. Vs. Ann has a pretty good job.)
B2. quite a/an + noun (without an adjective) It was a quite a surprise (= quite a big surprise)
B3. quite a lot of ~ (e.g. There were quite a lot of people at the meeting)
B4. quite + verb, especially like and enjoy (e.g. I quite like golf, but it’s not my favourite sport)

C. Rather is similar to quite and pretty. Often use rather for negative ideas.
C1. use rather for positive ideas (good/ nice etc.), it means ‘unusually’ or ‘surprisingly’

D. Fairly is weaker than quite/ rather/ pretty

E. Quite also means ‘completely’ (e.g. Are you sure? Yes, quite sure (=completely sure)
E1. Quite means completely with adjectives: sure, certain, right, wrong, true, safe, clear, obvious, different, unnecessary, incredible, extraordinary, amazing, impossible
E2. use quite (= completely) with some verbs (e.g. I quite agree with you. (= I completely agree)
Not quite = not completely