adj.无懈可击的；无瑕疵的
He was proud of his impeccable pedigree. 他为他出身于名门望族而骄傲。
He was proud of his impeccable good manners. 他为自己无可挑剔的端庄举止而感到自豪。
From this we can see her impeccable moral integrity. 从这件事上，我们看到了她白璧无暇的美好心灵。
