strenuous
From LSJ
ὃ γὰρ βούλεται, τοῦθ' ἕκαστος καὶ οἴεται → what he wishes to be true, each person also believes to be true | what he wishes, each person also believes
adj.
P. and V. ἔντονος, σύντονος, ὀξύς, πρόθυμος, σπουδαῖος, δραστήριος, P. σφοδρός.
Strong, intense: P. ἰσχυρός.