θεσπέσιος θεός, ἔσπον εἶπον, v. θέσπις properly of the voice, divinely sounding, divinely sweet, Hom., Pind. that can be spoken by none but God, i. e. unspeakable, ineffable; hence, like θεῖος, divine, Hom.; dat. fem. θεσπεσίῃ (sc. βουλῇ) by the will of God, Hom.; θ. ὁδός the way of divination, of Cassandra, Aesch. wondrous, marvellous, portentous, awful, of things, Hom.; θ. χαλκός marvellous fine brass, Od., Il.; θ. ὀδμή a smell divinely sweet, Od.; so in Hdt., θεσπέσιον ὡς ἡδύ:—of human affairs, θ. φόβος Il., etc. adv. -ίως, θ. ἐφόβηθεν they trembled unspeakably, Il.: so neut. as adv., Theocr.