| 单词 | impregnable |
| 例句 | impregnable adjective 1.•the fortress is impregnable:invulnerable, impenetrable, unassailable, inviolable, secure, strong, well fortified, well defended | invincible, unconquerable, unbeatable, indomitable, indestructible. ANT vulnerable. 2.•he displayed a calm, impregnable certainty:unassailable, unbeatable, undefeatable, unshakable, invincible, unconquerable, invulnerable. ANT shaky, vulnerable.WORD TOOLKIT See |
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