ἐπὶ τοῖς δεινοῖς

From LSJ

ᾗ μήτε χλαῖνα μήτε σισύρα συμφέρει → content neither with cloak nor rug, be never satisfied, can't get no satisfaction, be hard to please

Source

Greek > English (Woodhouse)

in time of danger, in time of peril