Etymology
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plainly (adv.)

late 14c., "frankly, candidly; without a doubt, truly; in a clear and distinct manner; simply, straightforwardly," from plain (adj.) + -ly (2). Meaning "simply, frugally" is from 1560s.

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Definitions of plainly

plainly (adv.)
in a simple manner; without extravagance or embellishment;
she was dressed plainly
Synonyms: simply
plainly (adv.)
unmistakably (`plain' is often used informally for `plainly');
You are plainly wrong
Synonyms: obviously / evidently / manifestly / patently / apparently / plain
From wordnet.princeton.edu