Sentence:  There is an openness, a quickness, almost a bluntness in Mr. Weston, which every body likes in him, because there is so much good-humour with it—but that would not do to be copied. Neither would Mr. Knightley's <WSD>downright</WSD>, decided, commanding sort of manner, though it suits him very well; his figure, and look, and situation in life seem to allow it; but if any young man were to set about copying him, he would not be sufferable. 
Meaning of the word marked with <WSD> tags:  Using plain direct language; accustomed to express opinions directly and bluntly; blunt.