plainly vs obviously

plainly and obviously both are adverbs.

Word	Noun	Adjective	Verb	Adverb
plainly	No	No	No	Yes
obviously	No	No	No	Yes

As adverbs, plainly and obviously are synonyms defined as:

plainly and obviously: unmistakably (`plain' is often used informally for `plainly')

Other synonyms of plainly include apparently, evidently, manifestly, patently, plain.

plainly (adverb)	obviously (adverb)
unmistakably (`plain' is often used informally for `plainly')	unmistakably (`plain' is often used informally for `plainly')
in a simple manner; without extravagance or embellishment