Stupid, dull, obtuse, stolid, doltish, sluggish, brainless, bovine.

Or instantly I'll crush thy idle coxcomb, And dash thy doltish brains against thy cave.

With doltish and double inconsistency, Weld first calls this "The article a employed in the sense of a preposition," (E. Gram., p. 177,) and afterwards adopts Murray's interpretation as above cited!

Once a high priest of Apollo Had two nephews soft and silly, More than silly, wretched creatures, More than wretched, doltish drivels; And perceiving from experience How love smartens up its victims, He but said to them this only, "Fall in love at least, ye ninnies".