unnatural/ˌənˈnætʃərəl/Comparativemore unnaturalSuperlativemost unnatural1contrary to what is accepted as normalThe robot's movements looked stiff and unnatural.Her bright purple hair seemed unnatural to her conservative parents.The silence in the forest felt eerie and unnatural.Using chemicals to grow giant vegetables is unnatural.Synonyms: abnormalAntonyms: normal2not in accordance with or determined by nature; contrary to natureAntonyms: natural3speaking or behaving in an artificial way to make an impressionSynonyms: affectedAntonyms: unaffected