Synonyms for Plainly:

adv.

all (adverb)
simply.
artlessly (adverb)
sincerely, straightforwardly, openly, directly, naively, genuinely, naturally, honestly, unrestrainedly, unsophisticatedly, un-artificially, bluntly, unaffectedly, frankly, candidly, unartfully, artlessly.
certainly (adverb)
undoubtedly, positively, incontestably, definitely, indisputably, undeniably, incontrovertibly, surely, Doubtlessly, irrefutably, trustingly, unquestionably, indubitably, veritably, assuredly, obviously, unequivocally, steadfastly, absolutely, clearly, certainly, irrefragably.
clearly (adverb)
evidently, visibly, manifestly, apparently, obviously.
humbly (adverb)
sheepishly, meekly, modestly, contritely, humbly, Abashedly, mildly, selflessly, apologetically, unobtrusively, unpretentiously, unassumingly, submissively.
intelligibly (adverb)
crisply, legibly, consistently, perspicaciously, coherently, understandably, Comprehensibly, intelligibly, lucidly.
modestly (adverb)
virtuously, unobtrusively.
openly (adverb)
naturally.
purely (adverb)
starkly, basically, guiltlessly, essentially, simply, Aboriginally, angelically, immaculately, fundamentally, purely, chastely, barely, elementarily, austerely, virtuously, primarily, irreducibly, Indivisibly, faultlessly, Stainlessly, sinlessly, formatively, cleanly, spotlessly, Atomically, innocently.
simply (adverb)
tersely, baldly, sparely.
tastelessly (adverb)
blandly, weakly, tastelessly, Stalely, vapidly, flatly, insipidly, banally.
visibly (adverb)
evidently, observably, distinctly, perceivably, apparently, visibly, Discernibly, manifestly, perceptibly.

adv

artlessly (adverb)
straightforwardly, artlessly, honestly, naturally, directly, candidly, openly, unrestrainedly, unaffectedly, sincerely, naively, trustingly, bluntly, un-artificially, unartfully, unsophisticatedly, frankly, genuinely.
certainly (adverb)
undoubtedly, positively, incontestably, definitely, indisputably, undeniably, incontrovertibly, surely, Doubtlessly, irrefutably, trustingly, unquestionably, indubitably, veritably, assuredly, obviously, unequivocally, steadfastly, absolutely, clearly, certainly, irrefragably.
humbly (adverb)
sheepishly, meekly, modestly, contritely, humbly, Abashedly, mildly, selflessly, apologetically, unobtrusively, unpretentiously, unassumingly, submissively.
intelligibly (adverb)
consistently, legibly, crisply, directly, Comprehensibly, straightforwardly, understandably, intelligibly, coherently, clearly, perspicaciously, lucidly.
literally (adverb)
veritably.
modestly (adverb)
unpretentiously, chastely, unassumingly.
openly (adverb)
artlessly.
purely (adverb)
starkly, basically, guiltlessly, essentially, simply, Aboriginally, angelically, immaculately, fundamentally, purely, chastely, barely, elementarily, austerely, virtuously, primarily, irreducibly, Indivisibly, faultlessly, Stainlessly, sinlessly, formatively, cleanly, spotlessly, Atomically, innocently.
simply (adverb)
innocently, candidly, clearly, austerely, baldly, unsophisticatedly, chastely, directly, artlessly, sparely, tersely, simply, purely.
tastelessly (adverb)
insipidly, tastelessly, flatly, banally, blandly, weakly, Stalely, mildly, vapidly.
unmistakably (adverb)
obviously.
visibly (adverb)
perceptibly, observably, distinctly, manifestly, visibly, perceivably, Discernibly, apparently, evidently, clearly.
without doubt (adverb)
surely.

n.

identifiable, noticeable, distinct, visible, apparent, perceptible, show up, manifest, obvious. principled, irreproachable, genuine, honest, sincere, upstanding, truthful, decent, good, fine. obvious (noun)
clear, observable, significant, self-evident, pronounced, blatant.
plainly (noun)
patently, evidently, simply, apparently, manifestly, obviously, plain.
undecorated (noun)
spare, bare, unadorned, austere, functional, simple, spartan.

Other synonyms:

undecorated
functional, simple, unadorned, spartan, spare, austere.
Other relevant words:
clear, obvious, visible, plain, patently, apparent.

Usage examples for plainly

  1. He may have seen me plainly – Jane Cable by George Barr McCutcheon
  2. The groan sounded very plainly and did seem to come from the room off the kitchen. – Six Little Bunkers at Grandpa Ford's by Laura Lee Hope
  3. He had spoken plainly enough. – The Duke's Children by Anthony Trollope