mysterious
From LSJ
English > Greek (Woodhouse)
adjective
secret: P. and V. κρυπτός; see secret.
obscure: P. and V. ἀσαφής, ἀφανής, ἄδηλος.
dark: P. and V. αἰνιγματώδης, V. δυσμαθής, ἄσημος, ἀξύμβλητος, ἄσκοπος, αἰολόστομος, ἐπάργεμος, δυστόπαστος, δυστέκμαρτος, δυσεύρετος, ψελλός, αἰνικτός, Ar. and P. ἀτέκμαρτος.
not to be spoken: P. and V. ἄρρητος, ἀπόρρητος.
not to be meddled with: P. and V. ἀκίνητος (Plato).