If you describe something as unsurpassed, you are emphasizing that it is better or greater than anything else of its kind.
例句
The quality of Smallbone furniture is unsurpassed.斯莫爾本恩家具品質超凡。...the Hamburg weekly, surely unsurpassed in the world for its intellectual range and quality.在漢堡出版的這份周刊視野廣博，見解深刻，無疑卓絕于世