adjective, heavier, heaviest.
of great weight; hard to lift or carry: a heavy load.
of great amount, quantity, or size; extremely large; massive: a heavy vote; a heavy snowfall.
of great force, intensity, turbulence, etc.: a heavy sea.
of more than the usual or average weight: a heavy person; heavy freight.
having much weight in proportion to bulk; being of high specific gravity: a heavy metal.
of major import; grave; serious: a heavy offense.
deep or intense; profound: a heavy thinker; heavy slumber.
thickly armed or equipped with guns of large size. Compare heavy cruiser.
(of guns) of the more powerful sizes: heavy weapons. Compare heavy artillery.
hard to bear; burdensome; harsh; oppressive: heavy taxes.
hard to cope with; trying; difficult: a heavy task.
being as indicated to an unusually great degree: a heavy buyer.
broad, thick, or coarse; not delicate: heavy lines drawn in charcoal.
weighted or laden: air heavy with moisture.
fraught; loaded; charged: words heavy with meaning.
depressed with trouble or sorrow; showing sorrow; sad: a heavy heart.
without vivacity or interest; ponderous; dull: a heavy style.
slow in movement or action; clumsy: a heavy walk.
loud and deep; sonorous: a heavy sound.
(of the sky) overcast or cloudy.
exceptionally dense in substance; insufficiently raised or leavened; thick: heavy doughnuts.
(of food) not easily digested.
being in a state of advanced pregnancy; nearing childbirth: heavy with child; heavy with young.
having a large capacity, capable of doing rough work, or having a large output: a heavy truck.
producing or refining basic materials, as steel or coal, used in manufacturing: heavy industry.
sober, serious, or somber: a heavy part in a drama.
Chemistry. of or pertaining to an isotope of greater than normal atomic weight, as heavy hydrogen or heavy oxygen, or to a compound containing such an element, as heavy water.
very good; excellent.
very serious or important: a really heavy relationship.
noun, plural heavies.
a somber or ennobled theatrical role or character: Iago is the heavy in Othello.
the theatrical role of a villain.
an actor who plays a theatrical heavy.
Military. a gun of great weight or large caliber.
Slang. a very important or influential person: a reception for government heavies.

before 900; Middle English hevi, Old English hefig, equivalent to hef(e) weight (akin to heave) + -ig -y1

heaviness, noun
overheaviness, noun
overheavy, adjective
ultraheavy, adjective
unheaviness, noun
unheavy, adjective

1. ponderous, massive, weighty. 5. dense. 9. onerous, grievous, cumbersome; difficult, severe. 14. Heavy, momentous, weighty refer to anything having a considerable amount of figurative weight. Heavy suggests the carrying of a figurative burden: words heavy with menace. Momentous emphasizes the idea of great and usually serious consequences: a momentous occasion, statement. Weighty seldom used literally, refers to something heavy with importance, often concerned with public affairs, which may require deliberation and careful judgment: a weighty matter, problem. 15. gloomy, mournful, dejected, despondent, downcast, downhearted. 16. tedious, tiresome, wearisome, burdensome, boring. 17. sluggish, lumbering. 19. lowering, gloomy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
heavy (ˈhɛvɪ)
adj , heavier, heaviest
1.  of comparatively great weight: a heavy stone
2.  having a relatively high density: lead is a heavy metal
3.  great in yield, quality, or quantity: heavy rain; heavy traffic
4.  great or considerable: heavy emphasis
5.  hard to bear, accomplish, or fulfil: heavy demands
6.  sad or dejected in spirit or mood: heavy at heart
7.  coarse or broad: a heavy line; heavy features
8.  (of soil) having a high clay content; cloggy
9.  solid or fat: heavy legs
10.  Compare light (of an industry) engaged in the large-scale complex manufacture of capital goods or extraction of raw materials
11.  serious; grave
12.  military
 a.  armed or equipped with large weapons, armour, etc
 b.  (of guns, etc) of a large and powerful type
13.  Compare light (of a syllable) having stress or accentuation
14.  dull and uninteresting: a heavy style
15.  prodigious: a heavy drinker
16.  (of cakes, bread, etc) insufficiently leavened
17.  deep and loud: a heavy thud
18.  of music, literature, etc
 a.  dramatic and powerful; grandiose
 b.  not immediately comprehensible or appealing
19.  slang
 a.  unpleasant or tedious
 b.  wonderful
 c.  (of rock music) having a powerful beat; hard
20.  weighted; burdened: heavy with child
21.  clumsy and slow: heavy going
22.  permeating: a heavy smell
23.  cloudy or overcast, esp threatening rain: heavy skies
24.  not easily digestible: a heavy meal
25.  (of an element or compound) being or containing an isotope with greater atomic weight than that of the naturally occurring element: heavy hydrogen; heavy water
26.  horse racing (of the going on a racecourse) soft and muddy
27.  slang using, or prepared to use, violence or brutality: the heavy mob
28.  informal heavy on using large quantities of: this car is heavy on petrol
n , heavier, heaviest, heavies
29.  a.  a villainous role
 b.  an actor who plays such a part
30.  military
 a.  a large fleet unit, esp an aircraft carrier or battleship
 b.  a large calibre or weighty piece of artillery
31.  informal (usually plural) the heavies a serious newspaper: the Sunday heavies
32.  informal a heavyweight boxer, wrestler, etc
33.  slang a man hired to threaten violence or deter others by his presence
34.  (Scot) strong bitter beer
35.  a.  in a heavy manner; heavily: time hangs heavy
 b.  (in combination): heavy-laden
[Old English hefig; related to hebban to heave, Old High German hebīg]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. hefig, from P.Gmc. *khabigas (cf. O.N. hebig, O.N. hofugr), from *kafjanan and thus related to heave (q.v.). Theatrical (noun) sense of "villain" is 1880, from the adj. Jazz slang sense of "profound, serious" is from 1937. Heavy-handed was originally (1633) "weary" or "clumsy," sense of "overbearing"
is first recorded 1883. Heavyweight is 1857, of horses, 1877 of fighters.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for heaviness
Heaviness weight of product perceived when first placed on tongue.
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