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

Examples
Ella colocó el jarrón de cristal cuidadosamente sobre la mesa.
She carefully placed the crystal vase on the table.
Debemos revisar cuidadosamente el contrato antes de firmar cualquier cosa.
We must carefully review the contract before signing anything.
El cirujano procedió cuidadosamente para evitar dañar los nervios vitales.
The surgeon proceeded cautiously to avoid damaging vital nerves.
How Adverbs End
In Spanish, many words that tell you 'how' an action is done end in '-mente', which is like adding '-ly' in English. This word describes the verb (the action).
The Root Adjective
The word comes from the feminine version of the adjective 'cuidadoso' (careful), which is 'cuidadosa'. You always add '-mente' to the feminine form of the adjective.
Mixing Adjective and Adverb
Mistake: “Hizo la tarea cuidadoso.”
Correction: Hizo la tarea cuidadosamente. (The '-mente' ending is needed because you are describing how the action ('hizo') was performed, not describing the noun.)
Related Translations
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