insidiose
From LSJ
Latin > English (Lewis & Short)
insĭdĭōsē: adv., v. insidiosus.
Latin > French (Gaffiot 2016)
īnsĭdĭōsē¹³ (insidiosus), traîtreusement, par fraude : Cic. Rab. Post. 33 ; -sissime Cic. Q. 1, 3, 8.
Latin > German (Georges)
īnsidiōsē, Adv. m. Superl. (insidiosus), hinterlistig, heimtückisch, ränkevoll, Cic. u.a. – Superl. insidiosissime, Cic. ad Q. fr. 1, 3, 8.