rigorously
From LSJ
Μετὰ τὴν δόσιν τάχιστα γηράσκει χάρις → Post munera cito consenescit gratia → Gleich nach der Gabe altert äußerst schnell der Dank
adv.
Sternly: P. σκληρῶς, σχετλίως, P. and V. πικρῶς; see pitilessly. Exactly, accurately: P. and V. ἀκριβῶς.