Πολλὰ τὰ δεινὰ κοὐδὲν ἀνθρώπου δεινότερον πέλει → There are many wondrous things in this world, but none more wondrous than humans
P. σφοδρός, P. and V. θερμός.
eager: P. and V. ἔντονος, σύντονος, ὀξύς; see eager.
vigorous: P. and V. νεανικός; see vigorous.