The Collaborative International Dictionary of English v.0.48:

Clearly \Clear"ly\, adv.
   In a clear manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

clearly
    adv 1: without doubt or question; "they were clearly lost";
           "history has clearly shown the folly of that policy"
    2: in an intelligible manner; "the foreigner spoke to us quite
       intelligibly" [syn: intelligibly, clearly,
       understandably] [ant: unintelligibly, ununderstandably]
    3: clear to the mind; with distinct mental discernment; "it's
       distinctly possible"; "I could clearly see myself in his
       situation" [syn: distinctly, clearly]
    4: in an easily perceptible manner; "could be seen clearly under
       the microscope"; "She cried loud and clear" [syn: clearly,
       clear]

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "clearly":
   absolutely, actually, aloud, and no mistake, apparently,
   apprehensibly, articulately, assuredly, at all events, at any rate,
   audibly, by all means, certainly, coherently, comprehensibly,
   conspicuously, decidedly, decisively, definitely, demonstrably,
   discernibly, distinctly, evidently, explicitly, expressly,
   for a certainty, for a fact, for certain, for real, for sure,
   forsooth, glaringly, in all conscience, in plain English,
   in plain terms, in plain words, in truth, incontestably, indeed,
   indeedy, indubitably, intelligibly, limpidly, lucidly, manifestly,
   markedly, most assuredly, most certainly, nothing else but,
   noticeably, observably, obviously, of course, out, out loud,
   palpably, patently, pellucidly, perceivably, perceptibly,
   perspicuously, plainly, positively, prominently, pronouncedly,
   quite, really, recognizably, seeably, sensibly, seriously, simply,
   staringly, starkly, surely, to a certainty, truly, unambiguously,
   unconcealedly, undeniably, understandably, undisguisedly,
   undoubtedly, unequivocally, unmistakably, unquestionably, utterly,
   verily, visibly, with clarity, without doubt