adjective heavier heav′i·er, heaviest heav′i·est

1. hard to lift or move because of great weight; weighty
2. of high specific gravity; of concentrated weight for the size
3. above the usual or defined weight: said of goods, certain animals, etc.
4. larger, greater, or more intense than usual or normal; specif.,
   1. falling or striking with great force or impact a heavy blow
   2. of greater than usual quantity a heavy vote
   3. violent and intense; rough a heavy sea
   4. loud, deep, and resounding heavy thunder
   5. thick, coarse, or massive heavy features
   6. going beyond the average; to a greater than usual extent a heavy drinker
   7. prolonged and intense heavy applause
   8. weighed down trees heavy with apples
5. of great importance; serious; grave; profound a heavy responsibility
6. hard to endure; oppressive; burdensome; distressing heavy taxes
7. hard to do or manage; difficult heavy work
8. grievous; lamentable heavy sorrow
9. burdened with sorrow; depressed a heavy heart
10. burdened with sleep or fatigue heavy eyelids
11. capable of carrying a load of great weight a heavy truck
12. characterized by density, hardness, fullness, etc. suggestive of weight; specif.,
    1. hard to digest a heavy meal
    2. not leavened properly; doughy a heavy cake
    3. remaining in the atmosphere; clinging; penetrating a heavy odor
    4. overcast; cloudy; gloomy; lowering a heavy sky
    5. hard to work with or travel over because of mud, sand, clay, etc. a heavy soil
13. tedious, dull, or strained heavy humor
14. clumsy; unwieldy; physically awkward a heavy gait
15. ☆ steeply inclined a heavy grade
16. designating any large industry that uses massive machinery and produces raw or processed materials, as steel, basic to other industries
17. designating, of, or equipped with massive or relatively heavy weapons, armor, etc.
18. Chem.
    1. designating an isotope of greater atomic weight than the normal or most abundant isotope
    2. designating a compound containing such isotopes
19. Theater serious, tragic, or villainous
20. Slang very serious or important and, often, depressing
21. Slang excellent, important, serious, etc.

Etymology: ME hevi < OE hefig (akin to OHG hebig) < base of hebban (see heave) + -ig (see -y): prob. basic sense “containing something, full”

adverb heavier, heaviest

noun pl. heavies heav′·ies

1. something heavy
2. Theater
   1. a serious, tragic, or villainous role
   2. an actor who plays such roles
3. Slang an influential or important person