3 adverbs to describe how to fitful

This short movement, that in its oneness was complete, grew, as it were, by fragmentary harmonies, intricate, but most gradual, into another,a prestissimo so delicately fitful that it was like moonlight dancing upon crested ripples; or, for a better similitude, like quivering sprays in a summer wind.

His eyes flashed up to hers in the glass, glowing with the smouldering fire, oddly fitful, oddly persistent.

Still the declining sun glowed with unnatural intensity of hue; and the evening breeze swept over the town in unusually fitful and stormy gusts.

3 adverbs to describe how to  fitful  - Adverbs for  fitful