ἀνάπτυχος
From LSJ
ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational
English (LSJ)
ον,
A = ἀνάπτυκτος, Arist.HA528a14.
German (Pape)
[Seite 204] was sich öffnen läßt, Arist. H. A. 4, 4, 2.