Devoid of help or protection
Having no protecting or concealing cover
Explosive mixtures of marsh-gas and air may be fired by an unprotected light.
He sought in vain for an unprotected point.
The ditch was choked, the gates were unprotected; the tumbled mass of irregular mud buildings which constituted the city clung tightly to the walls; there were no gun emplacements.
Even the waggon vaults over the nave, choir and transepts are of stone unprotected by lead or tiles.
Another option, used for many years, is taking regular birth control pills within 72 hours of unprotected sexual intercourse.