[syn: heavily, intemperately, hard]
The Collaborative International Dictionary of English v.0.48:
Heavily \Heav"i*ly\, adv. [From 2d Heavy.]
   1. In a heavy manner; with great weight; as, to bear heavily
      on a thing; to be heavily loaded.
      [1913 Webster]
            Heavily interested in those schemes of emigration.
                                                  --The Century.
      [1913 Webster]
   2. As if burdened with a great weight; slowly and
      laboriously; with difficulty; hence, in a slow, difficult,
      or suffering manner; sorrowfully.
      [1913 Webster]
            And took off their chariot wheels, that they drave
            them heavily.                         --Ex. xiv. 25.
      [1913 Webster]
            Why looks your grace so heavily to-day? --Shak.
      [1913 Webster]
   3. Greatly; intensely; as, heavily involved in a plot;
      heavily invested in real estate.
      [PJC]
   4. In large quantity; as, it rained heavily.
      [PJC]
WordNet (r) 3.0 (2006):
heavily
    adv 1: to a considerable degree; "he relied heavily on others'
           data" [syn: heavily, to a great extent]
    2: in a heavy-footed manner; "he walked heavily up the three
       flights to his room"
    3: with great force; "she hit her arm heavily against the wall"
    4: in a manner designed for heavy duty; "a heavily constructed
       car"; "heavily armed"
    5: slowly as if burdened by much weight; "time hung heavy on
       their hands" [syn: heavy, heavily]
    6: in a labored manner; "he breathed heavily"
    7: indulging excessively; "he drank heavily" [syn: heavily,
       intemperately, hard] [ant: lightly]
Moby Thesaurus II by Grady Ward, 1.0:
71 Moby Thesaurus words for "heavily":
   apathetically, aridly, barrenly, bleakly, bloodlessly,
   burdensomely, close, closely, coldly, colorlessly, compactly,
   cumbersomely, densely, dismally, dormantly, draggily, drearily,
   drearisomely, dryly, dully, dustily, effetely, emptily, firmly,
   funereally, gloomily, gravely, grimly, heavy, hollowly,
   impassively, inactively, inanely, inertly, insipidly, jejunely,
   languidly, languorously, latently, leadenly, lifelessly, onerously,
   pallidly, passively, phlegmatically, ploddingly, pointlessly,
   ponderously, sadly, slowly, sluggishly, solemnly, solidly,
   somberly, sombrously, spiritlessly, stagnantly, statically,
   stodgily, stoically, stolidly, stuffily, superficially,
   tastelessly, tediously, thick, thickly, torpidly, uninterestingly,
   vapidly, weightily