The Collaborative International Dictionary of English v.0.48:
Gleeful \Glee"ful\, a. Merry; gay; joyous. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
gleeful adj 1: full of high-spirited delight; "a joyful heart" [syn: elated, gleeful, joyful, jubilant]