UNPEG
Un*peg", v. t. Etym: [1st pref. un- + peg.]

Defn: To remove a peg or pegs from; to unfasten; to open. Shak.

UNPEN
Un*pen", v. t. Etym: [1st pref. un- + pen.]

Defn: To release from a pen or from confinement. "If a man unpens another's water." Blackstone.

UNPENETRABLE
Un*pen"e*tra*ble, a.

Defn: Impenetrable.

UNPENITENT
Un*pen"i*tent, a.

Defn: Impenitent. Sandys.

UNPEOPLE
Un*peo"ple, v. t. Etym: [1st pref. un- + people.]

Defn: To deprive of inhabitants; to depopulate. Shak.