modified
immovable, invulnerable, unconquerable, secure; see safe 1, strong 2.
See impregnable in Webster's New World Roget's A-Z Thesaurus II
Incapable of being conquered, overrun, or subjugated:
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Also Mentioned In
» dangerous
» formidable
» fortress
» invincible
» negligible
» safe
» tenable
» the
» unassailable
» villain
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