1. untiring - Adjective
2. untiring - Adjective Satellite
characterized by hard work and perseverance
Source: WordNetThe dynamic element in my philosophy, taken as a whole, can be seen as an obstinate and untiring battle against the spirit of abstraction. Gabriel Marcel
London times – the untiring energy, the business-like accuracy, the keen perception and reliable judgment, and above all the inflexible integrity which marked his private life, he carried without abatement of one jot into his public career. Alexander Mackenzie
Again and again, the cicada's untiring cry pierced the sultry summer air like a needle at work on thick cotton cloth. Yukio Mishima
The most profitable and praiseworthy genius in the world is untiring industry. Elias Lyman Magoon
And let all Americans remember that no problem of human making is too great to be overcome by human ingenuity, human energy, and the untiring hope of the human spirit. I believe this. I would not have asked to be your President if I didn't. George H. W. Bush
Her untiring efforts in spreading education among Muslim women by running a school and convincing families to send their girls to study are extremely praiseworthy and worth emulating. Source: Internet