unfriendly

not easy to understand or use; "user-unfriendly"

not disposed to friendship or friendliness; "an unfriendly coldness of manner"; "an unfriendly action to take"

not friendly; "an unfriendly act of aggression"; "an inimical critic"

very unfavorable to life or growth; "a hostile climate"; "an uncongenial atmosphere"; "an uncongenial soil"; "the unfriendly environment at high altitudes"