This is the 4490th most frequent French word.
inutilisable
Unable to be used.
Here, "inutilisable" is used as an adjective to describe the computer as being in a state where it cannot be used.
Cet ancien ordinateur est inutilisable à cause de sa vétusté.
This old computer is unusable due to its obsolescence.
In this case, "inutilisable" is applied to describe the condition of the road being unsuitable or impossible to use.
La route est inutilisable après l'accident, il faut trouver un autre itinéraire.
The road is unusable after the accident; we must find another route.
"Inutilisable" here indicates that the screwdriver cannot be used for the intended purpose or task due to a mismatch in specifications.