nequissimus
From LSJ
Latin > English
nequissimus nequissima, nequissimum ADJ :: most wicked/vile/licentious/worthless, good for nothing; (nequam)
Latin > English (Lewis & Short)
nēquissĭmus: a, um, v. nequam.
Latin > French (Gaffiot 2016)
nēquissĭmus, superl. de nequam.
Latin > German (Georges)
nēquissimus, a, um, s. nequam.