I had speculated that words with references as recent as the 19 century would not be considered obsolete or archaic because of their use within about 200 years of the modern day. This word blows that theory right out of the water. The most recent reference is from 1870, so there must be some other criteria for what makes a word obsolete and archaic, neh?
adrad, ppl. a.¹
Obs. or arch.
Frightened, greatly afraid, put in dread. Const. gen. or of; dat. inf.; subord. clause; W. Morris has at.