The Collaborative International Dictionary of English v.0.48:

Amply \Am"ply\, adv.
   In an ample manner.
   [1913 Webster]

WordNet (r) 3.0 (2006):

amply
    adv 1: to an ample degree or in an ample manner; "these voices
           were amply represented"; "we benefited richly" [syn:
           amply, richly] [ant: meagerly, meagrely,
           slenderly, sparingly]
    2: sufficiently; more than adequately; "the evidence amply (or
       fully) confirms our suspicions"; "they were fully (or amply)
       fed" [syn: amply, fully] [ant: meagerly, meagrely,
       slenderly, sparingly]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "amply":
   abundantly, acceptably, acutely, adequately, admissibly, agreeably,
   amazingly, appropriately, astonishingly, awesomely, becomingly,
   broadly, commensurately, competently, conspicuously, copiously,
   eminently, emphatically, enough, exceptionally, expansively,
   exquisitely, extensively, extraordinarily, exuberantly, famously,
   fittingly, fully, generously, glaringly, greatly, impressively,
   incredibly, intensely, largely, lavishly, liberally, magically,
   magnanimously, magnificently, markedly, marvelously, minimally,
   nobly, notably, particularly, passably, peculiarly, pointedly,
   preeminently, profusely, prominently, pronouncedly, properly,
   remarkably, richly, right, satisfactorily, satisfyingly, signally,
   singularly, splendidly, strikingly, substantially, sufficiently,
   suitably, superlatively, surpassingly, surprisingly, tolerably,
   uncommonly, unstintingly, unusually, well, widely, wonderfully,
   wondrous, worthily