unspeakable
From LSJ
καὶ τὸ σιγᾶν πολλάκις ἐστὶ σοφώτατον ἀνθρώπῳ νοῆσαι → and silence is often the wisest thing for a man to heed, and often is man's best wisdom to be silent, and often keeping silent is the wisest thing for a man to heed
English > Greek (Woodhouse)
adj.
P. and V. ἄρρητος, ἀπόρρητος, P. ἀμύθητος, V. ἄφραστος, ἄγρυκτος, ἀναύδητος, ἀνεκλάλητος, ἄλεκτος, δύσφατος, ἄσπετος, ἀφώνητος, ἀναυδής, ἄεπτος, ἀνέκφραστος, ἀθέσφατος, ἀπειρέσιος, ἄλαλος, ἀνεκφώνητος, ἄφθεγκτος, ἄφατος, ἀπόφημος, ἄναυδος, ἀλάλητος.
indescribable: P. ἀμύθητος, P. and V. κρείσσων λόγου, Ar. οὐ φατός, Ar. and V. ἀνωνόμαστος.
extraordinary: P. and V. ἀμήχανος.