Having great weight.
Serious, somber.
Not easy to bear; burdensome; oppressive.
(slang) Good.
Profound.
High, great.
(slang) Armed.
Loud, distorted, or intense.
Hot and humid.
Doing the specified activity more intensely than most other people.
With eyelids difficult to keep open due to tiredness.
High in fat or protein; difficult to digest.
Of great force, power, or intensity; deep or intense.
Laden with that which is weighty; encumbered; burdened; bowed down, either with an actual burden, or with grief, pain, disappointment, etc.
Slow; sluggish; inactive; or lifeless, dull, inanimate, stupid.
Impeding motion; cloggy; clayey.
Not raised or leavened.
Having much body or strength.
(obsolete) With child; pregnant.
Containing one or more isotopes that are heavier than the normal one.
Having high viscosity.
Of a market: in which the price of shares is declining.
Heavily-armed.
Having a relatively high takeoff weight and payload.
Having a relatively high takeoff weight and payload.

To make heavier.
To sadden.
(informal) To use power or wealth to exert influence on, e.g., governments or corporations; to pressure.