μάτην
Etym. from μά^τη
1. "in vain, idly, fruitlessly", Lat. frustra, Hhymn., Pind., attic; μ. ὁ μόχθος "in vain" the labour, Aesch.; with a Noun, τὸ μ. ἄχθος the "fruitless" burthen, id=Aesch.
2. "at random, without reason", Lat. temere, Theogn., Hdt., attic; ὁ νοσῶν μ., of a madman, Soph.
3. "idly, falsely", Lat. falso, id=Soph.; μ. βέβακεν, of a dream, Aesch.