Etymology
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heavily (adv.)

Old English hefiglice "violently, intensely; sorrowfully; sluggishly," from hefig (see heavy (adj.)) + -ly (2). Meaning "with much weight" is from early 14c.

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Definitions of heavily

heavily (adv.)
to a considerable degree;
he relied heavily on others' data
Synonyms: to a great extent
heavily (adv.)
in a heavy-footed manner;
he walked heavily up the three flights to his room
heavily (adv.)
with great force;
she hit her arm heavily against the wall
heavily (adv.)
in a manner designed for heavy duty;
heavily armed
a heavily constructed car
heavily (adv.)
slowly as if burdened by much weight;
Synonyms: heavy
heavily (adv.)
in a labored manner;
he breathed heavily
heavily (adv.)
indulging excessively;
he drank heavily
Synonyms: intemperately / hard
From wordnet.princeton.edu