fickle
From LSJ
Ἕκτορ νῦν σὺ μὲν ὧδε θέεις ἀκίχητα διώκων → Hector, you run in pursuit of something unattainable | Hector, now art thou hasting thus vainly after what thou mayest not attain | Hector, now you are hasting thus vainly after what you may not attain
English > Greek (Woodhouse)
adjective
P. and V. ἔμπληκτος, ἄπιστος, P. εὐμετάβολος, ἀκατάστατος, Ar. μετάβουλος, Ar. and P. ἀστάθμητος.
so fickle are the ways of fortune: V. ὡς ἐφήμεροι τύχαι (Eur., Heraclidae 866).
