vigorous
From LSJ
πέτρην κοιλαίνει ρανὶς ὕδατος ἐνδελεχείῃ → constant dropping wears away a stone, constant dripping will wear away the hardest stone, little strokes fell big oaks, constant dripping wears the stone, constant dropping wears the stone, constant dripping will wear away a stone
English > Greek (Woodhouse)
adjective
strong: P. and V. ἰσχυρός, Ar. and V. παγκρατής, καρτερός, V. κραταιός, ὄβριμος, ἐγκρατής, σθεναρός, P. ἐρρωμένος.
in one's prime: P. and V. ὡραῖος, V. ἀκμαῖος, θαλερός, χλωρός, Ar. ὡρικός, Ar. and P. νεαλής.
effective: P. and V. δραστήριος.
energetic: P. and V. ἔντονος, σύντονος, ὀξύς.
vehement: P. σφοδρός, P. and V. νεανικός; see vehement.
be vigorous, v.: P. and V. ἀκμάζειν, ἰσχύειν, σφριγᾶν, ἡβᾶν, Ar. and V. εὐσωματεῖν, V. εὐσθενεῖν (Eur., Cyclops).