Fitful means starting and stopping irregularly, happening in short bursts with pauses in between. When something is fitful, it doesn't flow smoothly or steadily.

Sleep becomes fitful when you keep waking up throughout the night, dozing off for a bit, then stirring again. A fitful breeze blows strong for a moment, dies down, then gusts again unpredictably. Progress on a difficult project might be fitful when you work intensely one day, get stuck and do nothing the next, then make another push forward.

The word captures that jerky, uneven quality. Think of a candle flame sputtering in the wind or someone having a fitful conversation where they keep pausing mid-sentence, unsure what to say next. A student making fitful attempts at homework might work for ten minutes, stare out the window, work a bit more, then take a break.

Fitful usually suggests something unsatisfying or incomplete. Smooth, steady effort tends to accomplish more than fitful bursts of energy.