Not effective.
Not able to assume active duty.
A member of the military who is unable to assume active duty.
Resistant or impervious to something.
Repulsive, inspiring aversion.
Tending or able to repel; driving back.
Someone who repels.
A substance used to repel insects, other pests, or dangerous animals.
A substance or treatment for a fabric etc to make it impervious to something.