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Heavily

/ˈhevəli/

A manner with a lot of weight, power, or stress, often more than usual.

Synonyms:

The rain was falling heavily.

Where's Aileen?" Butler walked heavily in and took his seat.

Something clanked, and the door swung open, heavily, slowly.

Derived from Middle English heveli, originating from Old English hefiglīce, related to heavy.

29 mentions per 1 million words

Often

Hint: Frequency according to COCA