unfit

Not fit; not having the correct requirements.

Jack cannot run, making him unfit for the track team.

The latter engine was found unfit to take its return working at 5.35 p.m. from Luton, and No. 45616, Malta G.C., was provided by Kentish Town as substitute.

Not fit, not having a good physical demeanor.

I've become so unfit after stopping cycling to town.

Unsuitable for a particular purpose.

Sadly, the station that proves to be the busiest - Blackpool Pleasure Beach - is unfit for purpose. It possesses a tiny canopy back from the platform that offers little in the way of shelter or amenities, other than a couple of benches.

To make unfit; to render unsuitable, spoil, disqualify.

He [...] added that he was fearful Christianity, or rather Christians, had unfitted him for ascending the pure and undefiled throne of thirty pagan Kings before him.

These preoccupations unfitted the soldiers for the defence of the frontier, and permitted vigorous incursions of Germans form the north and Persians from the east.