fit·ful 
/ˈfɪtfəl/ adjective
/ˈfɪtfəl/ adjective [more fitful; most fitful] : not regular or steady
▪ He had a few fitful hours of sleep. ▪ Several fitful attempts at negotiation have failed. ▪ making slow, fitful progress
▪ He had a few fitful hours of sleep. ▪ Several fitful attempts at negotiation have failed. ▪ making slow, fitful progress
— fit·ful·ly adverb
▪ progressing fitfully ▪ He slept fitfully [=restlessly] for a few hours.
▪ progressing fitfully ▪ He slept fitfully [=restlessly] for a few hours.
— fit·ful·ness noun [noncount]
