Sentence:  Mr. Lamb, on the contrary, being "native to the manner here," though he too has borrowed from previous sources, instead of availing himself of the most popular and admired, has groped out his way, and made his most successful researches among the more obscure and intricate, though certainly not the least <WSD>pithy</WSD> or pleasant of our writers. 
Meaning of the word marked with <WSD> tags:  Concise and meaningful.