Unfriendly

wiktionary

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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”).

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

etymonline

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unfriendly (adj.)

early 15c., "not characteristic of friends, hostile, inimical," from un- (1) "not" + friendly. Similar formation in Middle Dutch onvriendelijc, Middle High German unvriuntlich, German unfreundlich. Old English had unferondlice "unkindly." Related: Unfriendliness.