1) Apparently 2) As anyone can see 3) Austerely 4) Cleanly 5) Evidently 6) How to see the obvious 7) In a simple manner 8) Manifestly 9) Minimally 10) Modestly 11) Obviously 12) Patently 13) Plain 14) Simply 15) Unmistakably 1) Bluntly 2) Candidly 3) Clearly 4) Comprehensibly 5) Definitely 6) De plano 7) Evidently 8) Factually 9) Honestly 10) In black and white 11) Literally 12) Manifestly 13) Noticeably 14) Obviously 15) Openly 16) Patently 17) Physically 18) Roughly 19) Rudely 20) Severely 
• (adv.) In a plain manner; clearly.
Plain'ly adverb In a plain manner; clearly. 
[adv] - in a simple manner