unfit

Etymology

From un- + fit.

adj

1. Not fit; not having the correct requirements.
   Jack cannot run, making him unfit for the track team.
2. Not fit, not having a good physical demeanor.
   I've become so unfit after stopping cycling to town.
3. (often with for) 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. November 2 2022, Paul Bigland, “New trains, old trains, and splendid scenery”, in RAIL, number 969, page 56

verb

1. To make unfit; to render unsuitable, spoil, disqualify.
   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. 1946, Bertrand Russell, History of Western Philosophy, I.30
   This life entirely unfits you for general practice. 2018, Anna Rogers, With Them Through Hell, page 403
   The Select Committee on Transport (Metropolitan Area) of 1919 concluded the following: "Trains were crowded not merely to excess, but almost to danger point. The crush in the 'peak hours' not only overloaded public conveyances, but subjected travellers - particularly the old, the feeble and women - to an amount of suffering, the effects of which often unfitted them temporarily for their ordinary duties." April 8 2020, Dr David Turner, “How railway staff were conduits and victims of a pandemic”, in Rail, page 31