How to Say "heavily" in Spanish
The Spanish word for “heavily” is “fuertemente” — B1 level. This is a very common word in everyday Spanish.

Examples
Tienes que presionar el botón fuertemente.
You have to press the button hard.
Anoche sopló el viento fuertemente.
The wind blew strongly last night.
Esa noticia me afectó fuertemente.
That news affected me deeply.
Creating '-ly' words
In Spanish, adding '-mente' to the end of an adjective is just like adding '-ly' in English to describe how something is done.
The Accent Secret
Even though 'fuertemente' doesn't have a written accent mark, you pronounce it as if it has two 'stress' points: one on 'fuer' and the main one on 'men'.
Using it for people's traits
Mistake: “Él es fuertemente.”
Correction: Say 'Él es fuerte.' Use 'fuertemente' only to describe an action, not a person's character or appearance.
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