A word a day

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Agelast (AJ-uh-last)
noun Someone who never laughs.

From Greek agelastos (not laughing), ultimately from gelaein (to
laugh).

“Anyway, [Sandi Toksvig] has to go off now. To do an hour of stand-up which the audience absolutely loves. I don’t spot a single agelast.”
—Independent (London)