Difference between Gruelling and Heavy

Gruelling

Part of speech: adjective

Definition: So difficult or taxing as to make one exhausted; backbreaking.

Heavy

Part of speech: adjective

Definition: Having great weight.Serious, somber.good.Profound.High, great.armed.louder, more distortedhot and humiddoing the specified activity more intensely than most other people.high in fat or protein; difficult to digest.Of great force, power, or intensity; deep or intense;laden to a great extent.

Part of speech: noun

Definition: A villain or bad guy; the one responsible for evil or aggressive acts.A doorman, bouncer or bodyguard.

Part of speech: verb

Definition: To use power and/or wealth to exert influence on, e.g., governments or corporations.

Example sentence: To some people heavy metal is Motorhead and to others it's Judas Priest.