unremittent

Does the best care of a child require the concentrated and unremittent devotion of an entire mother?

That guttural, scolding voice, unremittent as the hissing of a steam pipe, is Mrs. Rasnosky.

It was from beginning to end sane and reasonable and yet vigorous and unremittent.

But shame is the rarest thing in the world: what he felt was this unremittent curiosity about his old employer's thoughts.