Adjective
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very unfavorable to life or growth
"a hostile climate"
"an uncongenial atmosphere"
"an uncongenial soil"
"the unfriendly environment at high altitudes"
-
not friendly
"an unfriendly act of aggression"
"an inimical critic"
-
not disposed to friendship or friendliness
"an unfriendly coldness of manner"
"an unfriendly action to take"
-
not easy to understand or use
"user-unfriendly"