1552, from obsolete adj.
grate "agreeable, thankful," from L.
gratus "pleasing" (see
grace). "A most unusual formation" [Weekley]. Hard to think of another case where Eng. uses
-ful to make an adj. from an adj.
Grateful Dead, the San Francisco rock band, took its name, according to Jerry Garcia, from a dictionary entry he saw about the folk tale motif of a wanderer who gives his last penny to pay for a corpse's burial, then is magically aided by the spirit of the dead person. A different version of the concept is found in the Hebrew Kaddish and the Egyptian Book of the Dead.