P. and V. ἄρρητος, ἀπόρρητος, P. ἀμύθητος, V. ἄφραστος.
indescribable: P. ἀμύθητος, P. and V. κρείσσων λόγου, Ar. οὐ φατός, Ar. and V. ἀνωνόμαστος.
extraordinary: P. and V. ἀμήχανος.