undefended

adj.

无防备的，无论据的，无辩护人的；

1. The coast was undefended and lay open to attack .
   该海岸未设防，易受攻击。
2. 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。

Defensible Space Undefended
Defended versus undefended home range size of carnivores, ungulates and primates
On nudging and informed consent--four key undefended premises.
Defensible Space Undefended: Social Factors in Crime Control Through Environmental Design
Predators' decisions to eat defended prey depend on the size of undefended prey
Trapline Foraging by Hermit Hummingbirds: Competition for an Undefended, Renewable Resource
How can automimicry persist when predators can preferentially consume undefended mimics?
Hawaiian ant—flower networks: nectar-thieving ants prefer undefended native over introduced plants with floral defenses
Ant–flower networks in Hawai'i: nectar–thieving ants prefer undefended native over introduced plants with floral defenses
Plant stages with biotic, indirect defences are more palatable and suffer less herbivory than their undefended counterparts