undefended

lacking protection from danger or resistance against attack the cowardly soldiers fled, leaving the palace undefended Synonyms defenseless, exposed, susceptible, helpless, unguarded, unprotected, unresistant, vulnerableRelated Words indefensible, untenable; uncovered, unsafe; overcome, preyed (on or upon); disarmed, passive, resistless, unarmed; feeble, frail, weak; abandoned, high and dry, maroonedNear Antonyms defensible; covered, fortified, safe, screened, secure, sheltered; armed, armored; immune, impenetrable, impregnable, invincible, strong, unassailable, unbeatable, unconquerable; almighty, omnipotentAntonyms guarded, invulnerable, protected, resistant, shielded