heavy |ˈhevē|adjective ( heavier , heaviest )1 of great weight; difficult to lift or move : the pan was too heavy for me to carry.• used in questions about weight : how heavy is it?• [ attrib. ] (of a class of thing) above the average weight; large of its kind : heavy artillery.• [ predic. ] weighed down; full of something : branches heavy with blossoms.• (of a person's head or eyes) feeling weighed down by weariness : a heavy head.• Physics of or containing atoms of an isotope of greater than the usual mass. See also heavy water .2 of great density; thick or substantial : heavy gray clouds | a heavy blanket.• (of food or a meal) hard to digest; too filling.• (of ground or soil) hard to travel over or work with because muddy or full of clay.• not delicate or graceful; coarse : he had a big mustache and heavy features.• moving slowly or with difficulty : steering that is heavy when parking.• Aviation, informal (of a large aircraft) leaving a large amount of turbulence behind in its flight.• (of a smell) overpowering : the air was heavy with the sweet odor of apples.• (of the sky) full of dark clouds; oppressive : a heavy thundery sky.3 of more than the usual size, amount, or force : rush hour traffic was heavy and I was delayed.• doing something to excess : a heavy smoker.• ( heavy on) using a lot of : stories heavy on melodrama.4 striking or falling with force : a heavy blow to the head | we had heavy overnight rain.• causing a strong impact : a heavy fall.• (of music, esp. rock) having a strong bass component and a forceful rhythm.5 needing much physical effort : long hours and heavy work.• mentally oppressive; hard to endure : a heavy burden of responsibility.• important or serious : a heavy discussion.• (of a literary work) hard to read or understand because overly serious or difficult.• feeling or expressing grief : I left him with a heavy heart.• informal (of a situation) serious and hard to deal with : things were getting pretty heavy.• informal (of a person) strict or harsh : the police were really getting heavy.noun ( pl. heavies)1 a thing, such as a vehicle, that is large or heavy of its kind.• informal a large, strong man, esp. one hired for protection : I needed money to pay off the heavies.• an important person : music business heavies.• ( heavies) Brit., informal serious newspapers : reporters from the Sunday heavies.2 a villainous role or actor in a book, movie, etc. : we've got to have this guy play the heavy.3 chiefly Scottish strong beer, esp. bitter : a pint of heavy.adverbheavily : his words hung heavy in the air | [in combination ] heavy-laden.PHRASESheavy with child pregnant.make heavy weather of see weather .DERIVATIVESheavily |ˈhevəlē| adverbheaviness nounheavyish adjectiveORIGIN Old English hefig, of Germanic origin; related to Dutch hevig, also to heave .