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.
user-unfriendly
an unfriendly coldness of manner
an unfriendly action to take
an unfriendly act of aggression
the unfriendly environment at high altitudes
unfortune
unfounded
unfree
unfrequented
unfriend
unfriendly
unfruitful
unfulfilled
unfunded
unfunny
unfurl
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