不堪一击 incapable of withstanding a single blow
Explanation
不堪一击，汉语成语，拼音是bù kān yī jī，意思是经不起一击，形容力量薄弱，经不起打击。也比喻论点不严密，经不起反驳。
Unbearable a blow; weak and easily defeated; untenable arguments
Origin Story
话说古代有一座城池，城墙高耸，守军精锐，号称坚城。然而，新任守将却骄奢淫逸，不理军务，士兵训练松懈，武器装备老化，城防设施破败不堪。一日，敌军来犯，气势汹汹。守将轻敌冒进，率领残兵败将出城迎战。结果，敌军一触即溃，城池轻易陷落。这便是“不堪一击”的真实写照。
Once upon a time, there was a mighty kingdom boasting an impenetrable fortress, its walls soaring high and its soldiers renowned for their bravery. However, the new commander, consumed by luxury and indolence, neglected his duties. The soldiers lacked training, their weapons were outdated, and the fortifications were crumbling. When an enemy army finally attacked, the commander, blinded by arrogance, led his ill-prepared forces to meet the enemy. The enemy army, however, proved far stronger than anticipated and the kingdom fell with little resistance. This is a perfect example of “incapable of withstanding a single blow”.
Usage
常用来形容军事实力或论据的薄弱，也用于比喻其他方面力量的不足。
It is often used to describe the weakness of military strength or arguments, but it is also used to describe the lack of strength in other aspects.
Examples
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敌人的军队不堪一击，很快就被打败了。
di ren de jundui bu kan yi ji,hen kuai jiu bei da baile.
The enemy army was easily defeated.
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他的论点不堪一击，经不起推敲。
ta de ludian bu kan yi ji,jing bu qi tuiao.
His arguments were weak and could not withstand scrutiny..