undefended
adj. 无防备的；无人拥护的；无辩护人的
sp. 动词undefend的过去式和过去分词形式.
近义词：unguarded，unprotected，unfortified，deserted，defenceless，defenseless，exposed，vulnerable，open，assailable，undefendable，
英英释义
Adjective
- not defended or capable of being defended;
"an open city" "open to attack"
例句
用作形容词(adj.)
- The coast was undefended and lay open to attack .该海岸未设防，易受攻击。
- It's single undefended spot is its fleshy, armor-less underside.它唯一没有防备的地方是它没有甲片保护的腹部。