We can only say that what is fittest for the monkey is ill-fitted for man, and the reverse.
In fact, Anne de Montmorency was ill-fitted to win popularity.
George III was ill-fitted by nature to deal with the crisis.
Almost all the ships were ill-fitted and ill-provisioned for so long a voyage.
He made them into that which they did not want to be, and for which they were ill-fitted.