Ἀδμείν

From LSJ

γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at

Source

English (Abbott-Smith)

Ἀδμείν (WH, mg., Ἀδάμ), 6, indecl.,
Admin.: Lk 3:33. †