unexpected
From LSJ
English > Greek (Woodhouse)
adjective
P. and V. ἀπροσδόκητος, ἀδόκητος (Euripides, Hercules Furens 92), ἀνέλπιστος, Ar. and V. ἄελπτος, V. ποταίνιος, ἀφρόντιστος (Aesch., Agamemnon 1377).
sudden: Ar. and P. αἰφνίδιος, P. ἐξαιφνίδιος, V. ἀφνίδιος, ἐπίσσυτος, πρόσπαιος.
from causes unexpected and unforeseen: V. ἐξ ἀέλπτων κἀπρομηθήτων (Aesch., Supplices 357).