From appearances alone:
— Irrigation often produces bumper crops from apparently desert land.

synonyms: on the face of it, ostensibly, seemingly.

Roget 448: apparently; to all seeming, to all appearance; ostensibly, seemingly, as it seems, on the face of it, prima facie [Lat.]; at the first blush, at first sight; in the eyes of; to the eye.   

Roget 472: probably etc. adj.; belike^†; in all probability, in all likelihood; very likely, most likely; like enough; odds on, odds in favor, ten to one &c.; apparently, seemingly, according to every reasonable expectation; prim=a facie [Lat.]; to all appearance etc. (to the eye) 448.    ... show more

Unmistakably (`plain' is often used informally for `plainly'):
— She has apparently been living here for some time.
— I thought he owned the property, but apparently not.

synonyms: evidently, manifestly, obviously, patently, plain, plainly.