Wordnet 3.0
ADJECTIVE (1)
1.
not defended or capable of being defended;
- Example: "an open city"- Example: "open to attack"[syn: assailable, undefendable, undefended, open]
WordNet (r) 3.0 (2006):
undefendable
adj 1: not defended or capable of being defended; "an open
city"; "open to attack" [syn: assailable,
undefendable, undefended, open]