Main entry: invulnerable
Definition: immune to attack; impregnable
Usage: gunners raked the beach from invulnerable positions on the cliffs
Antonyms: vulnerable
Definition: susceptible to attack
Antonyms: insecure
Definition: lacking self-confidence or assurance
Definition: lacking in security or safety
Antonyms: insecure
Definition: not firm or firmly fixed; likely to fail or give way
Antonyms: leaky
Definition: permitting the unwanted passage of fluids or gases
Antonyms: loose
Definition: not tight; not closely constrained or constricted or constricting
Antonyms: violable
Definition: capable of being violated
Antonyms: weak
Definition: wanting in physical strength