Person having the ability to reason and understand but makes decisions and choices not suibable to the purpose.
Person's rent is due but no matter they take 1/2 the money and get a tatoo saying the landlord won't mind. Later that afternoon they decide to buy beer and go to the beach because the landlord won't like getting half the rent. Rest of week is spent avoiding the landlord. Finally landlord catches up with the renter and has him evicted on the basis that he is intellectually inept and this pattern will likely continue.