How to Say "unnecessary" in Spanish
The most common Spanish word for “unnecessary” is “innecesario” — use 'innecesario' when something is not needed, required, or essential, without implying it's useless or broken..
innecesario
/een-neh-seh-sah-ryoh//ineθeˈsaɾjo/

Examples
No compres ese abrigo, es innecesario.
Don't buy that coat, it's unnecessary.
Llevar comida a la fiesta fue innecesario porque ya había mucha.
Bringing food to the party was needless because there was already a lot.
Queremos evitar cualquier riesgo innecesario durante el viaje.
We want to avoid any unnecessary risk during the trip.
Matching the word it describes
Just like most adjectives in Spanish, this word must change its ending to match the noun. Use 'innecesario' for masculine (un comentario innecesario) and 'innecesaria' for feminine (una aclaración innecesaria).
Where to put it
Usually, you place this word after the thing you are describing. If you say 'un gasto innecesario', it sounds natural. Placing it before the noun makes it sound very poetic or emphatic.
The spelling trap
Mistake: “unnecesario”
Correction: innecesario
Double 'N' confusion
Mistake: “inecesario”
Correction: innecesario
inútil
Examples
Esas herramientas están rotas, son completamente inútiles.
Those tools are broken; they are completely useless.
Innecesario vs. Inútil
Related Translations
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