不懈 (bù xiè) means “tireless” | MotiTan Chinese Dictionary

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科学家们对真理的不懈追求推动了学科的发展。kē xué jiā men duì zhēn lǐ de bú xiè zhuī qiú tuī dòng le xué kē de fā zhǎn

Scientists' tireless pursuit of truth drove the field's development.

A steady drive that does not ease or stop, even over a long period.

坚持不懈jiān chí bú xiè: Continuing firmly without giving up or stopping along the way.
持之以恒chí zhī yǐ héng: Maintained steadily and consistently for a long time.
坚韧jiān rèn: Showing a strong will and the ability to keep going through difficulty.
顽强wán qiáng: Showing the strength to endure hardship and keep going with force.

长期坚持投入精力，不松懈也不间断的努力或态度。cháng qī jiān chí tóu rù jīng lì bù sōng xiè yě bú jiàn duàn de nǔ lì huò tài dù

不 (bù, "not") + 懈 (xiè, "slacken") frames effort as something that never slackens, giving the word its sense of sustained commitment.

This adjective fits serious praise of study, work, or long-term goals more naturally than relaxed chat between friends.