improperus

ὕπνος δεινὸν ἀνθρώποις κακόν → sleep is a terrible evil for humans (Menander, Sententiae monostichoi 1.523)

Latin > English (Lewis & Short)

imprŏpĕrus: (inpr-), a, um, adj. 2. in-properus,
I not hasting, slow: sorores, Sil. 3, 96.