Usage Note
Inutilisable is formed from the prefix in- (not) plus utilisable (usable), itself from utiliser (to use). It agrees in gender and number: une route inutilisable, des outils inutilisables. A softer synonym is hors d'usage (out of service).
Examples
"Mon téléphone est complètement inutilisable."
Natural Translation
My phone is completely unusable.

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