dexteritas
From LSJ
Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → But for extreme illnesses, extreme remedies, applied with severe exactitude, are the best (Hippocrates, Aphorism 6)
Latin > English (Lewis & Short)
dextĕrĭtas: ātis, f. dexter, II..
I Dexterity, aptness, readiness in doing good offices (rare and not ante-Aug.): tanta inerat comitas Scipioni atque ad omnia naturalis ingenii dexteritas, Liv. 28, 18, 6; 37, 7, 15; Gell. 13, 16, 1 al.—*
II Prosperity, felicity, Arn. 7, p. 225.