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Definitions from the Web

Term: Impenetrable

Part of Speech: Adjective

Sense 1: Difficult or impossible to penetrate, pass through, or enter.

Sample Sentence: The fortress was surrounded by impenetrable walls, making it impossible for anyone to breach the defenses.

Sense 2: Not capable of being understood or comprehended.

Sample Sentence: The professor's lecture on quantum physics was completely impenetrable to most of the students.

Sense 3: Unyielding, impossible to be influenced or affected.

Sample Sentence: Her strong, impenetrable determination helped her overcome all obstacles and achieve her goals.

Related Products on Amazon: Impenetrable Fortress, Impenetrable Physics: Decoding Quantum Theory, Impenetrable Mindset: Achieving Resilience and Success