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Etymology
From.

Adjective

 * 1) heavy; massive; hefty
 * 2) burdensome; onerous; demanding; stressful
 * 3)  slow; clumsy; awkward
 * 4)  fat; chunky; obese

Adverb

 * 1) heavily; massively
 * 2) onerously; stressfully
 * 3)  clumsily; awkwardly