Meaning of “heavy” - Learner’s Dictionary

heavy

adjective uk us /ˈhevi/
WEIGHING A LOT

A2 Heavy objects weigh a lot:

heavy bags
HOW MUCH

A2 used to say how much someone or something weighs:

How heavy are you?
Oxygen is sixteen times heavier than hydrogen.
A LOT

B1 large in amount or degree:

heavy traffic
heavy costs
a heavy drinker/smoker

someone who drinks/smokes a lot

heavy snow/rain

an occasion when a lot of snow/rain falls

FORCE

using a lot of force:

a heavy blow
heavy breathing
SERIOUS informal

serious:

The discussion got a bit too heavy.
heavy going mainly UK

too serious or difficult:

I found the book very heavy going.

(Definition of “heavy” from the Cambridge Learner’s Dictionary © Cambridge University Press)