<p><strong>Adjective</strong></p><ul><li>not amicable;</li><li>not friendly or kindly in disposition;</li><li>unsympathetic;</li><li>aloof: an unfriendly coldness of manner.</li><li>hostile;</li><li>antagonistic: an unfriendly act of aggression.</li><li>unfavorable;</li><li>inhospitable or inimical, as an environment: an unfriendly climate for new ideas.</li></ul><p><strong>Adverb</strong></p><ul><li>in an unfriendly manner.</li></ul>