pernecesse

From LSJ

πεσούσης νυκτός, πάσα γυνὴ Λαΐς εστί → at nightfall, every woman is a Laïs | all cats are gray at night | all cats are gray by night | all cats are gray in the dark | all cats are grey at night | all cats are grey by night | all cats are grey in the dark | all women look the same with the lights off | when lights are out all women look the same

Source

Latin > English (Lewis & Short)

per-nĕcesse:
I adj. indecl., very necessary, indispensably necessary: cum pernecesse esset, Cic. Tull. 21, 49.

Latin > German (Georges)

per-necesse, Adv., unumgänglich notwendig, esse, Cic. pro Tull. 49.