How to Say "smoothly" in Spanish
The Spanish word for “smoothly” is “suavemente” — A2 level. This is a very common word in everyday Spanish.

Examples
Ella cerró la puerta suavemente para no despertar al bebé.
She closed the door softly so as not to wake the baby.
El viento soplaba suavemente entre los árboles.
The wind was blowing gently through the trees.
Aplica la crema suavemente sobre la piel.
Apply the cream gently on the skin.
The '-mente' Suffix
In Spanish, adding '-mente' to the end of a feminine adjective is just like adding '-ly' in English. It turns a description word into a word that explains how an action is done.
Adjective vs. Adverb
Mistake: “Using 'Ella habla suave.'”
Correction: Say 'Ella habla suavemente.' While people sometimes use the short version in slang, 'suavemente' is the correct way to describe the action of speaking.
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