prodigious
From LSJ
ἐνίοτε οἱ οἰκέται εἰς τὴν θάλασσαν ἐλαύνουσιν αὐτούς → sometimes the slaves ride them into the sea
adj.
Portentous: Ar. and P. τερατώδης. Extraordinary: Ar. and P. δαιμόνιος, θαυμάσιος, P. and V. ἀμήχανος, V. ἔκπαγλος; see extraordinary. Very large: P. ὑπερμεγεθής.