[blend of friend and enemy]
Someone with whom one is friendly, despite a fundamental
dislike or rivalry; someone who combines the characteristics
of a friend and an enemy
"Howz about calling the Russians our Frienemies?"
- Walter Winchell, Nevada State Jrnl 19 May, 1953
"Once she'd sat down, she realized that she had sort of
ducked past the mirror without looking at it, as if her own
reflection were a deeply estranged frenemy with whom she
could not possibly make eye contact."
- Neal Stephenson, REAMDE