Etymology
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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.

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Definitions of unfriendly

unfriendly (adj.)
not easy to understand or use;
user-unfriendly
unfriendly (adj.)
not disposed to friendship or friendliness;
an unfriendly coldness of manner
an unfriendly action to take
unfriendly (adj.)
not friendly;
an unfriendly act of aggression
Synonyms: inimical
unfriendly (adj.)
very unfavorable to life or growth;
the unfriendly environment at high altitudes
Synonyms: hostile / uncongenial
From wordnet.princeton.edu