What is the meaning of the word "heavy"?

Definitions:

(of an actor or role) being or playing the villain adjective
- Iago is the heavy role in `Othello'
(of sleep) deep and complete adjective
- a heavy sleep
(physics, chemistry) being or containing an isotope with greater than average atomic mass or weight adjective
- heavy hydrogen
(used of soil) compact and fine-grained adjective
- the clayey soil was heavy and easily saturated
darkened by clouds adjective
- a heavy sky
dense or inadequately leavened and hence likely to cause distress in the alimentary canal adjective
- a heavy pudding
full and loud and deep adjective
- heavy sounds
lacking lightness or liveliness adjective
- heavy humor
large and powerful adjective
- especially designed for heavy loads or rough work
made of fabric having considerable thickness adjective
- a heavy coat
of comparatively great physical weight or density adjective
- a heavy load
of great intensity or power or force adjective
- a heavy blow
of relatively large extent and density adjective
- a heavy line
requiring or showing effort adjective
- heavy breathing
sharply inclined adjective
- a heavy grade
slow and laborious because of weight adjective
- the heavy tread of tired troops
slowly as if burdened by much weight adverb
- time hung heavy on their hands
unusually great in degree or quantity or number adjective
- heavy taxes