pretty

adjectives

pleasing by delicacy or grace; not imposing
"pretty girl"; "pretty song"; "pretty room"
is derived from
is similar to
delighting the senses or exciting intellectual or emotional admiration
"a beautiful child"; "beautiful country"; "a beautiful painting"; "a beautiful theory"; "a beautiful party"
(used ironically) unexpectedly bad
"a pretty mess"; "a pretty kettle of fish"
is similar to
having undesirable or negative qualities
"a bad report card"; "his sloppy appearance made a bad impression"; "a bad little boy"; "clothes in bad shape"; "a bad cut"; "bad luck"; "the news was very bad"; "the reviews were bad"; "the pay is bad"; "it was a bad light for reading"; "the movie was a bad choice"
domain usage
a trope that involves incongruity between what is expected and what occurs

adverbs

to a moderately sufficient extent or degree
"pretty big"; "pretty bad"; "jolly decent of him"; "the shoes are priced reasonably"; "he is fairly clever with computers"