One article discusses the ideal state of flow, which occurs when being fully engaged... contrasted with being bored, understimulated, and suffering bore-out... which is described as the opposite problem of being chronically stressed, overstimulated, and suffering burn-out. Both bore-out and burn-out are said to manifest symptoms of depression.

Source: https://www.sengifted.org/post/bore-out-a-challenge-for-unchallenged-gifted-young-adults (March, 2020)