FITFUL
fitful, interrupted, off-and-on
(adjective) intermittently stopping and starting; “fitful (or interrupted) sleep”; “off-and-on static”
fitful, spasmodic
(adjective) occurring in spells and often abruptly; “fitful bursts of energy”; “spasmodic rifle fire”
Source: WordNet® 3.1
Etymology
Adjective
fitful (comparative more fitful, superlative most fitful)
Irregular; unsteady; characterized by fits.
Synonyms
• intermittent, spasmodic; see also discontinuous
Source: Wiktionary
Fit"ful, a. Etym: [From 7th Fit.]
Definition: 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 victorius trumpet peal Dies fitfully away. Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition