Fit·ful a. Full of fits; irregularly variable; impulsive and unstable.
After life's fitful fever, he sleeps well. --Shak.
-- Fit*ful*ly, adv. -- Fit*ful*ness, n.
The victorious trumpet peal
Dies fitfully away. --Macaulay.
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fitfully
adv : in a fitful manner; "he slept fitfully"