The Collaborative International Dictionary of English v.0.48:
Fitful \Fit"ful\, a. [From 7th Fit.] Full of fits; irregularly variable; impulsive and unstable. [1913 Webster] After life's fitful fever, he sleeps well. --Shak. -- Fit"ful*ly, adv. -- Fit"ful*ness, n. [1913 Webster] The victorious trumpet peal Dies fitfully away. --Macaulay. FithelWordNet (r) 3.0 (2006):
fitfulness n 1: the quality of being spasmodic and irregular [syn: fitfulness, jerkiness]