Remittent

A remittent fever is when at certain periods the fever is more violent than at others, but the patient never intirely free from it.

Source: wiktionary

Yet nine years elapsed before it [the dictionary] saw the light. His throes in bringing it forth had been severe and remittent, and at last we may almost conclude that the Caesarian operation was performed by the knife of Churchill, whose upbraiding satire, I dare say, made Johnson’s friends urge him to dispatch.

Source: wiktionary

I bethought myself to go upstairs and see how the dying woman sped, who lay there almost unheeded: the very servants paid her but a remittent attention: the hired nurse, being little looked after, would slip out of the room whenever she could.

Source: wiktionary

The noise of the conflict, the shouting and roar of an uncounted multitude of men in the heat and fury of combat, not to more than mention the evidences of the conflict—arrows, bolts, and stones in overflight and falling in remittent showers—would have dispersed them in ordinary mood; but they were under protection—the Madonna was leading them—to be afraid was to deny her saving grace.

Source: wiktionary