Sentence:  Literary Bengali of prose, during the greater part of the 19th century, was thus a doubly artificial language ; and, with its forms belonging to Middle Bengali, and its vocabulary highly Sanskritised, it could only be compared to a ‘ Modern English ' with a Chaucerian grammar and a super-<WSD>Johnsonian</WSD> vocabulary, if such a thing could be conceived. 
Meaning of the word marked with <WSD> tags:  Of or pertaining to the English writer and lexicographer (Samuel Johnson) (1709–1784), or characteristic of his style.