reasonably vs pretty

reasonably is not an adjective while pretty is an adjective.

Word	Noun	Adjective	Verb	Adverb
reasonably	No	No	No	Yes
pretty	No	Yes	No	Yes

As adverbs, reasonably and pretty are synonyms defined as:

Other synonyms of reasonably include fairly, jolly, middling, moderately, passably, somewhat.

reasonably (adjective)	pretty (adjective)
	(used ironically) unexpectedly bad
	pleasing by delicacy or grace; not imposing

reasonably (adverb)	pretty (adverb)
to certain extent or degree	to certain extent or degree
with good sense or in a reasonable or intelligent manner