adj.经久不衰的，可靠的，一贯的，永久的

Her love for him was unfailing, no matter what challenges they faced.
她对他的爱坚定不移，无论他们面临什么挑战。
The sun's unfailing rise every morning is a comforting reminder of constancy in an unpredictable world.
太阳每天早晨准时升起，是这个无常世界中令人安慰的永恒象征。
His unfailing optimism in the face of adversity inspired everyone around him.
他在逆境中始终乐观的态度鼓舞了他周围的所有人。
The old oak tree stood as an unfailing symbol of strength and endurance through the centuries.
那棵古老的橡树几个世纪以来一直是力量和耐力的不变象征。
The charity's unfailing commitment to helping the underprivileged earned them widespread respect.
这家慈善机构始终致力于帮助弱势群体，赢得了广泛的尊敬。
Her unfailing attention to detail made her an invaluable asset to the team.
她对细节的不懈关注使她成为团队中不可或缺的一员。
The athlete demonstrated unfailing determination and毅力 throughout the grueling competition.
运动员在整个艰苦的比赛中展现了坚定的决心和毅力。
The teacher's unfailing patience with her students was truly commendable.
老师对学生的无比耐心确实值得赞扬。
The friendship between these two women remained unfailing despite distance and time.
这两位女性之间的友谊尽管受到距离和时间的考验，仍然坚定不移。
The river flowed unfailingly, providing life-sustaining water to the surrounding land.
河水川流不息，为周边土地提供了维系生命的水源。