fundamental flaw
definitions
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A basic, essential, or structural error, defect, or weakness in a system, argument, character, or object that undermines its integrity, validity, or effectiveness.ko: 근본적인 결함
examples
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The theory was rejected because it contained a fundamental flaw in its logic.
그 이론은 논리에 근본적인 결함이 있어 거부되었다.