Source : Webster's Revised Unabridged Dictionary (1913)

Heavy \Heav"y\, a. [Compar. {Heavier}; superl. {Heaviest}.] [OE.
   hevi, AS. hefig, fr. hebban to lift, heave; akin to OHG.
   hebig, hevig, Icel. h["o]figr, h["o]fugr. See {Heave}.]
   1. Heaved or lifted with labor; not light; weighty;
      ponderous; as, a heavy stone; hence, sometimes, large in
      extent, quantity, or effects; as, a heavy fall of rain or
      snow; a heavy failure; heavy business transactions, etc.;
      often implying strength; as, a heavy barrier; also,
      difficult to move; as, a heavy draught.

   2. Not easy to bear; burdensome; oppressive; hard to endure
      or accomplish; hence, grievous, afflictive; as, heavy
      yokes, expenses, undertakings, trials, news, etc.

            The hand of the Lord was heavy upon them of Ashdod.
                                                  --1 Sam. v. 6.

            The king himself hath a heavy reckoning to make.
                                                  --Shak.

            Sent hither to impart the heavy news. --Wordsworth.

            Trust him not in matter of heavy consequence.
                                                  --Shak.

   3. Laden with that which is weighty; encumbered; burdened;
      bowed down, either with an actual burden, or with care,
      grief, pain, disappointment.

            The heavy [sorrowing] nobles all in council were.
                                                  --Chapman.

            A light wife doth make a heavy husband. --Shak.

   4. Slow; sluggish; inactive; or lifeless, dull, inanimate,
      stupid; as, a heavy gait, looks, manners, style, and the
      like; a heavy writer or book.

            Whilst the heavy plowman snores.      --Shak.

            Of a heavy, dull, degenerate mind.    --Dryden.

            Neither [is] his ear heavy, that it can not hear.
                                                  --Is. lix. 1.

   5. Strong; violent; forcible; as, a heavy sea, storm,
      cannonade, and the like.

   6. Loud; deep; -- said of sound; as, heavy thunder.

            But, hark! that heavy sound breaks in once more.
                                                  --Byron.

   7. Dark with clouds, or ready to rain; gloomy; -- said of the
      sky.

   8. Impeding motion; cloggy; clayey; -- said of earth; as, a
      heavy road, soil, and the like.

   9. Not raised or made light; as, heavy bread.

   10. Not agreeable to, or suitable for, the stomach; not
       easily digested; -- said of food.

   11. Having much body or strength; -- said of wines, or other
       liquors.

   12. With child; pregnant. [R.]

   {Heavy artillery}. (Mil.)
       (a) Guns of great weight or large caliber, esp. siege,
           garrison, and seacoast guns.
       (b) Troops which serve heavy guns.

   {Heavy cavalry}. See under {Cavalry}.

   {Heavy fire} (Mil.), a continuous or destructive cannonading,
      or discharge of small arms.

   {Heavy metal} (Mil.), large guns carrying balls of a large
      size; also, large balls for such guns.

Source : WordNet®

heaviest
     See {heavy}

heavy
     adj 1: of comparatively great physical weight or density; "a heavy
            load"; "lead is a heavy metal"; "heavy mahogony
            furniture" [ant: {light}]
     2: unusually great in degree or quantity or number; "heavy
        taxes"; "a heavy fine"; "heavy casualties"; "heavy
        losses"; "heavy rain"; "heavy traffic" [ant: {light}]
     3: of the military or industry; using (or being) the heaviest
        and most powerful armaments or weapons or equipment;
        "heavy artillery"; "heavy infantry"; "a heavy cruiser";
        "heavy guns"; "heavy industry involves large-scale
        production of basic products (such as steel) used by other
        industries" [ant: {light}]
     4: having or suggesting a viscous consistency; "heavy cream"
     5: wide from side to side; "a heavy black mark" [syn: {thick}]
     6: marked by great psychological weight; weighted down
        especially with sadness or troubles or weariness; "a heavy
        heart"; "a heavy schedule"; "heavy news"; "a heavy
        silence"; "heavy eyelids" [ant: {light}]
     7: usually describes a large person who is fat but has a large
        frame to carry it [syn: {fleshy}, {overweight}]
     8: (used of soil) compact and fine-grained; "the clayey soil
        was heavy and easily saturated" [syn: {clayey}, {cloggy}]
     9: darkened by clouds; "a heavy sky" [syn: {lowering}, {sullen},
         {threatening}]
     10: of great intensity or power or force; "a heavy blow"; "the
         fighting was heavy"; "heavy seas" [ant: {light}]
     11: (physics, chemistry) being or containing an isotope with
         greater than average atomic mass or weight; "heavy
         hydrogen"; "heavy water" [ant: {light}]
     12: (of an actor or role) being or playing the villain; "Iago is
         the heavy role in `Othello'"
     13: permitting little if any light to pass through because of
         denseness of matter; "dense smoke"; "heavy fog";
         "impenetrable gloom" [syn: {dense}, {impenetrable}]
     14: made of fabric having considerable thickness; "a heavy coat"
     15: of a drinker or drinking; indulging intemperately; "does a
         lot of hard drinking"; "a heavy drinker" [syn: {hard(a)}]
     16: prodigious; "big spender"; "big eater"; "heavy investor"
         [syn: {big(a)}, {heavy(a)}]
     17: used of syllables or musical beats [syn: {accented}, {strong}]
     18: full and loud and deep; "heavy sounds"; "a herald chosen for
         his sonorous voice" [syn: {sonorous}]
     19: of great gravity or crucial import; requiring serious
         thought; "grave responsibilities"; "faced a grave
         decision in a time of crisis"; "a grievous fault"; "heavy
         matters of state"; "the weighty matters to be discussed
         at the peace conference" [syn: {grave}, {grievous}, {weighty}]
     20: slow and laborious because of weight; "the heavy tread of
         tired troops"; "moved with a lumbering sag-bellied trot";
         "ponderous prehistoric beasts"; "a ponderous yawn" [syn:
         {lumbering}, {ponderous}]
     21: large and powerful; especially designed for heavy loads or
         rough work; "a heavy truck"; "heavy machinery"
     22: dense or inadequately leavened and hence likely to cause
         distress in the alimentary canal; "a heavy pudding"
     23: sharply inclined; "a heavy grade"
     24: full of; bearing great weight; "trees heavy with fruit";
         "vines weighed down with grapes" [syn: {weighed down}]
     25: requiring or showing effort; "heavy breathing"; "the subject
         made for labored reading" [syn: {labored}, {laboured}]
     26: characterized by toilsome effort to the point of exhaustion;
         especially physical effort; "worked their arduous way up
         the mining valley"; "a grueling campaign"; "hard labor";
         "heavy work"; "heavy going"; "spent many laborious hours
         on the project"; "set a punishing pace" [syn: {arduous},
         {backbreaking}, {grueling}, {gruelling}, {hard}, {laborious},
          {punishing}, {toilsome}]
     27: lacking lightness or liveliness; "heavy humor"; "a leaden
         conversation" [syn: {leaden}]
     28: (of sleep) deep and complete; "a heavy sleep"; "fell into a
         profound sleep"; "a sound sleeper"; "deep wakeless sleep"
         [syn: {profound}, {sound}, {wakeless}]
     29: in an advanced stage of pregnancy; "was big with child";
         "was great with child" [syn: {big(p)}, {enceinte}, {expectant},
          {gravid}, {great(p)}, {large(p)}, {heavy(p)}, {with
         child(p)}]
     [also: {heaviest}, {heavier}]

heavy
     adv : slowly as if burdened by much weight; "time hung heavy on
           their hands" [syn: {heavily}]
     [also: {heaviest}, {heavier}]

heavy
     n 1: an actor who plays villainous roles
     2: a serious (or tragic) role in a play
     [also: {heaviest}, {heavier}]