Sentence:  [H]is virtues, as well as imperfections, are as it were <WSD>tinged</WSD> by a certain extravagance, which makes them particularly his, and distinguishes them from those of other men. 
Meaning of the word marked with <WSD> tags:  To change slightly in shade due to the addition of colour;  to change slightly in quality due to the addition of some other thing.