frenemy


fren·e·my

F0319825 (frĕn′ə-mē)n. pl. fren·e·mies Informal A person who is ostensibly friendly or collegial with someone but who is actually antagonistic or competitive.
[Blend of friend and enemy.]

frenemy

(ˈfrɛnəmɪ) n, pl -mies1. a supposed friend who behaves in a treacherous manner2. a person who is considered as both a friend and a rival[C20: blend of friend and enemy ]