1. (adj) unfriendly
not easy to understand or use
Synonyms: uncongenial, hostile, inimical
Antonyms: amiable, companionate, friendly, hospitable, palsy-walsy, informal, neighbourly, matey, affable, pally, hail-fellow-well-met, cozy, couthy, amicable, social, hail-fellow, chummy, cordial, neighborly, comradely, genial, intimate, couthie
2. (adj) unfriendly
not disposed to friendship or friendliness
Synonyms: uncongenial, hostile, inimical
Antonyms: friendly, couthy, hospitable, comradely, companionate, cozy, amicable, couthie, cordial, neighbourly, hail-fellow-well-met, chummy, affable, matey, genial, amiable, intimate, hail-fellow, informal, neighborly, social, pally, palsy-walsy
3. (adj) unfriendly, inimical
not friendly
Synonyms: uncongenial, unfriendly, hostile, inimical
Antonyms: companionate, genial, chummy, cozy, pally, hail-fellow, couthy, friendly, social, intimate, neighbourly, palsy-walsy, cordial, comradely, hospitable, amiable, hail-fellow-well-met, informal, neighborly, amicable, couthie, matey, affable
4. (adj) hostile, uncongenial, unfriendly
very unfavorable to life or growth
Synonyms: uncongenial, hostile, incompatible, unfriendly, inimical
Antonyms: comradely, hail-fellow-well-met, palsy-walsy, chummy, hail-fellow, amiable, genial, cordial, matey, informal, couthy, social, friendly, couthie, hospitable, amicable, companionate, neighborly, neighbourly, pally, cozy, affable, intimate
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Synonyms for unfriendly 
