i Register
In some senses, fitful is marked as obsolete. Watch for register when choosing this word.
adj
Characterized by fits (convulsions or seizures).
Duncane is in his Graue: After Lifes fitfull Feuer, he ſleepes well, Treaſon ha's done his worſt: not Steele, not Poyſon, Mallice domeſtique, forraine Leuie, nothing, Can touch him further.
Characterized by sudden bursts of activity with periods of inactivity in between; intermittent, irregular, unsteady.
His breathing was fitful.
Troubled by her unfinished work, she fell into a fitful sleep.