The antonyms for the word "un-genial" are friendly, warm, hospitable, amiable, cordial, congenial, and affable. To be un-genial means to be cold, unfriendly, unsociable, or inhospitable. Being genial is the opposite of being unpleasant, harsh or unwelcoming. A person who is genial is easy to get along with, kind, and approachable. In contrast, a person who is un-genial is often aloof, rude, dismissive, or uninterested in socializing. In social and professional contexts, projecting a genial persona can help build relationships, boost morale, encourage collaboration, and foster empathy.