—adj. 1. of great weight; hard to lift or carry: a heavy load. 2. of great amount, quantity, or size; extremely large; massive: a heavy vote; a heavy snowfall. 3. of great force, intensity, turbulence, etc.: a heavy sea. 4. of more than the usual or average weight: a heavy person; heavy freight. 5. having much weight in proportion to bulk; being of high specific gravity: a heavy metal. 6. of major import; grave; serious: a heavy offense. 7. deep or intense; profound: a heavy thinker; heavy slumber. 8. Mil. a. thickly armed or equipped with guns of large size. Cf. heavy cruiser. b. (of guns) of the more powerful sizes: heavy weapons. Cf. heavy artillery. 9. hard to bear; burdensome; harsh; oppressive: heavy taxes. 10. hard to cope with; trying; difficult: a heavy task. 11. being as indicated to an unusually great degree: a heavy buyer. 12. broad, thick, or coarse; not delicate: heavy lines drawn in charcoal. 13. weighted or laden: air heavy with moisture. 14. fraught; loaded; charged: words heavy with meaning. 15. depressed with trouble or sorrow; showing sorrow; sad: a heavy heart. 16. without vivacity or interest; ponderous; dull: a heavy style. 17. slow in movement or action; clumsy: a heavy walk. 18. loud and deep; sonorous: a heavy sound. 19. (of the sky) overcast or cloudy.
20. exceptionally dense in substance; insufficiently raised or leavened; thick: heavy doughnuts. 21. (of food) not easily digested.
22. being in a state of advanced pregnancy; nearing childbirth: heavy with child; heavy with young. 23. having a large capacity, capable of doing rough work, or having a large output: a heavy truck. 24. producing or refining basic materials, as steel or coal, used in manufacturing: heavy industry. 25. sober, serious, or somber: a heavy part in a drama. 26. Chem.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.
27. Slang. a. very good; excellent.
b. very serious or important: a really heavy relationship. 28. Pros.(of a syllable)
—n. 1. a somber or ennobled theatrical role or character: Iago is the heavy in Othello.
2. the theatrical role of a villain.
3. an actor who plays a theatrical heavy.
4. Mil.a gun of great weight or large caliber.
5. Slang.a very important or influential person: a reception for government heavies.