百折不挠，汉语成语，意思是无论遭到多少挫折都不退缩（never yield in spite of reverses），比喻意志坚强，品节刚毅。可以翻译为be undaunted by repeated setbacks；dauntless；relentless。
例句：
百折不挠的精神
unyielding/relentless spirit
尽管他的想法屡遭非难，他好像仍然百折不挠。
He seemed undaunted by all the opposition to his idea.