The Greek akatapaustos means "not stopping," "ceaseless," or "restless." It appears in 2 Peter 2:14, describing the insatiable eyes of false teachers who never stop sinning.
Peter uses akatapaustos in his devastating portrait of false teachers: they have "eyes full of adultery" that "never stop sinning" (2 Peter 2:14). This restlessness is the opposite of the Sabbath rest God designed for humanity — a soul that cannot cease from sin has lost the capacity for true rest. In contrast, Hebrews 4 promises a Sabbath rest for the people of God. The restless soul finds no peace; the soul that rests in Christ finds what it was made for.