(uncountable, now rare) Ability of body or mind; power; force; vigor.

What's a word for not friendly?

adjective, un·friend·li·er, un·friend·li·est. not amicable; not friendly or kindly in disposition; unsympathetic; aloof: an unfriendly coldness of manner. hostile; antagonistic: an unfriendly act of aggression. unfavorable; inhospitable or inimical, as an environment: an unfriendly climate for new ideas.

Is Ableness a noun?

noun. The quality or condition of being able; ability; capacity for doing something.