unfriendly

Etymology 1

From Middle English unfrendly, unfrendli, unfrendely, from Old English *unfrēondlīċ (suggested by derivative unfrēondlīċe (“in an unfriendly manner; unfriendly”, adverb)), equivalent to un- + friendly. Cognate with Saterland Frisian uunfrüntelk, uunfjuntelk (“unfriendly”), West Frisian ûnfreonlik (“unfriendly”), Dutch onvriendelijk (“unfriendly”), German Low German unfrünnelk (“unfriendly”), German unfreundlich (“unfriendly”), Faroese ófryntligur (“unfriendly”), Icelandic ófrýnilegur (“ugly; disturbing”).

adj

1. Not friendly; hostile; mean.
2. Unfavourable.

noun

1. An enemy.
   Sweep the valley compound and eliminate any unfriendlies you encounter. 2005, Ted Dekker, Thunder of Heaven, page 217
   You see, the mission of almost every teenage girl on the loose is to first identify the targets, just like a war. These include the primary objective (the boy), the enemy (other girls), the friendlies (sympathetic girl friends and the boy's family), and unfriendlies (other boys). 2008, Dennis Wengert, A Very Healthy Insanity, page 44

Etymology 2

From Middle English unfrendli, from Old English unfrēondlīċe (“in an unfriendly manner”), equivalent to unfriend + -ly.

adv

1. in an unkind or unfriendly manner; not as a friend