impregnable (s)
inviolable (s)
secure (s)
strong (s)
unassailable (s)
unattackable (s)

a02526124

type s
lex_filenum 00
def immune to attack
def incapable of being tampered with
examples an impregnable fortress
fortifications that made the frontier inviolable
a secure telephone connection
Outgoing links
Similar to invulnerable
Derivationally related form impregnable → impregnability
Derivationally related form secure → secureness
Incoming links
Similar to invulnerable
Derived from adjective impregnably → impregnable
Derived from adjective securely → secure
Derivationally related form impregnability → impregnable
Derivationally related form secureness → secure

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