I have a new favorite read: The Word Detective.

A similar case that often raises questions is “disgruntled,” meaning “angry or aggrieved.” Many folks go looking for the term “gruntled,” which they feel must logically mean “happy.” Well, “gruntled” did exist at one point, but it meant “angry or cranky,” not “happy.” The “dis” in “disgruntled is really another intensifier, making “disgruntled” mean “very gruntled.”