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

Examples
Después de tanto esfuerzo, el éxito era inevitable.
After so much effort, success was inevitable.
Cometer errores es una parte inevitable del proceso de aprendizaje.
Making mistakes is an unavoidable part of the learning process.
La lluvia de mañana es inevitable, así que lleva tu paraguas.
Tomorrow's rain is inevitable, so take your umbrella.
Adjective Agreement (The -e ending)
Since 'inevitable' ends in '-e', it doesn't change its ending when describing a masculine or feminine noun. It only changes when describing plural things: 'el cambio inevitable' (masculine singular) and 'la derrota inevitable' (feminine singular).
Making it Plural
To make 'inevitable' describe more than one thing, simply add '-s': 'los problemas inevitables' (the inevitable problems) or 'las verdades inevitables' (the inevitable truths).
Over-agreement
Mistake: “La cosa inevitabla.”
Correction: La cosa inevitable. Remember, adjectives ending in '-e' usually stay the same for both masculine and feminine nouns.
Related Translations
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