impregnable

• 形容地方或建筑非常坚固、防守严密，无法被攻破或强行进入。也可比喻事物坚不可摧、不可动摇或无法被驳倒。

Describes a place or structure that is so strong and well-protected that it cannot be entered or captured by force.

1. UnassailableC1formal

   So strong and well-constructed that it cannot be attacked or captured.

   坚不可摧

   • The fortress was considered impregnable by the enemy.
   • They built an impregnable wall around the city.
   • His argument was logically impregnable.

   同义词fortifiedimpenetrableindestructibleinvincibleinvulnerablesecurestrongunassailable

   反义词assailabledefenselesspenetrableunprotectedvulnerableweak

2. FertileC2formal

   Capable of becoming pregnant or of conceiving offspring.

   能受孕的

   • The mare was confirmed to be impregnable by the veterinarian.
   • In some species, females are only impregnable during a specific season.
   • The study focused on factors that affect whether a woman is impregnable.

   同义词fecundfertilefruitfulprolific

3. InvincibleC1formal

   Incapable of being defeated, overcome, or refuted.

   坚不可摧

   • The team's defense seemed impregnable throughout the tournament.
   • Her confidence was an impregnable fortress against criticism.
   • The theory was considered impregnable until new evidence emerged.

   同义词indomitableinvincibleinvulnerableunassailableunbeatableunconquerable

   反义词defenselessexposedvulnerableweak