Anachronistic; being obviously inappropriate for its present context.
Calling a happy person gay seems awfullydated nowadays; people will assume you mean something else.
2018 November 13, Kate Julian, “Why Are Young People Having So Little Sex?”, inThe Atlantic[1]:
[She] changed the subject toSex and the City reruns and how hopelesslydated they seem. “Miranda meets Steve at abar,” she said, in a tone suggesting that the scenario might as well be out of a Jane Austen novel, for all the relevance it had to her life.
Then ſtrike vp Drum, and al the ſtarres that make The loathſome Circle of mydated life, Direct my weapon to his barbarous heart, That thus oppoſeth him againſt the Gods, And ſcornes the Powers that gouernePerſea.
