"unfriendlier" in the adjective sense
1. unfriendly
not easy to understand or use
"user-unfriendly"
2. unfriendly
not disposed to friendship or friendliness
"an unfriendly coldness of manner"
"an unfriendly action to take"
3. unfriendly, inimical
not friendly
"an unfriendly act of aggression"
"an inimical critic"
4. hostile, uncongenial, unfriendly
very unfavorable to life or growth
"a hostile climate"
"an uncongenial atmosphere"
"an uncongenial soil"
"the unfriendly environment at high altitudes"
Source: WordNet® (An amazing lexical database of English)
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