The Collaborative International Dictionary of English v.0.48:

Marked \Marked\ (m[aum]rkt), a.
   Designated or distinguished by, or as by, a mark; hence;
   noticeable; conspicuous; as, a marked card; a marked coin; a
   marked instance. -- Mark"ed*ly, adv. --J. S. Mill.
   [1913 Webster]

   A marked man, a man who is noted by a community, or by a
      part of it, as, for excellence or depravity; -- usually
      with an unfavorable suggestion.
      [1913 Webster]

WordNet (r) 3.0 (2006):

markedly
    adv 1: in a clearly noticeable manner; "sales of luxury cars
           dropped markedly"

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "markedly":
   abundantly, acutely, amazingly, amply, apparently, arrantly,
   astonishingly, awesomely, blatantly, boldly, characteristically,
   clearly, consequentially, conspicuously, copiously, definitely,
   discernibly, distinctively, distinctly, eminently, emphatically,
   evidently, exceptionally, exquisitely, extraordinarily,
   exuberantly, famously, flagrantly, generously, glaringly, grandly,
   greatly, importantly, impressively, incredibly, intensely,
   intrinsically, like no other, magically, magnanimously,
   magnificently, manifestly, marvelously, materially, momentously,
   nobly, notably, noticeably, notoriously, observably, obtrusively,
   obviously, ostensibly, outstandingly, particularly, patently,
   peculiarly, perceivably, perceptibly, plainly, pointedly,
   preeminently, profusely, prominently, pronouncedly, recognizably,
   remarkably, richly, saliently, seeably, signally, significantly,
   singularly, splendidly, staringly, starkly, strikingly,
   superlatively, surpassingly, surprisingly, uncommonly,
   unconcealedly, undisguisedly, uniquely, unmistakably, unusually,
   visibly, with clarity, wonderfully, wondrous, worthily