Unable to be scratched.

plural of proof positive

Alternative form of squirrelproof.

(humorous) Of a play or a dramatic part: sufficiently good that it should be able to succeed even with an inferior cast.

A small conductor attached to an insulated handle used to transfer electrical charge to a measuring instrument.

Proof that a hostage is still alive.

(historical) A high-quality proof taken from engraved plates by means of India paper.

plural of India proof

Without any qualms of conscience; not feeling guilty for one's misdeeds.

A building fitted for proving the barrels of firearms.