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

Examples
Ella accidentalmente borró todos los archivos de su computadora.
She accidentally deleted all the files on her computer.
Si tocas este botón accidentalmente, la alarma se disparará.
If you accidentally touch this button, the alarm will go off.
Nos encontramos accidentalmente en el supermercado después de años.
We ran into each other accidentally (by chance) at the supermarket after years.
The '-mente' Rule
In Spanish, words ending in '-mente' are usually adverbs (like English words ending in '-ly'). They are formed by taking the feminine form of an adjective (like 'accidental') and adding '-mente'.
Adverb Placement
Mistake: “Puse accidentalmente el libro en la mesa.”
Correction: Accidentalmente puse el libro en la mesa. (Correction: While the adverb can sometimes be placed mid-sentence, placing it before the verb or at the beginning of the sentence often sounds more natural in Spanish.)
Related Translations
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