definition of
unfitness

[1] #1 unfitness n. [softness] poor physical condition; being out of shape or out of condition (as from a life of ease and luxury). wn

[2] #2 unfitness n. [inability] lacking the power to perform. wn

[3] #3 unfitness n. the quality of not being suitable; "the judges agreed on his unfitness for the appointment". wn