• (a.) Pertaining to or resembling Dr. Johnson or his style; pompous; inflated.
John·so'ni·an adjective Pertaining to or resembling Dr. Johnson or his style; pompous; inflated. 
In the manner of Samuel Johnson. This is normally a reference to his grandiloquent prose style rather than to his poetic output.
of, pertaining to, or characteristic of Samuel Johnson or his works. · having the quality of Johnsonese.