Illhumored, also spelled as ill-humored, is an adjective that describes a person who is surly, grumpy, and irritable. Some antonyms for the word illhumored include affable, amiable, bright, cheerful, cordial, genial, gracious, happy, jolly, jovial, kind, pleasant, sociable, and sunny. These words describe a person who is friendly, warm, and approachable. An affable person is pleasant to be around, accommodating, and agreeable. Someone who is amiable is friendly, likable, and easygoing. A bright person radiates positive energy and is cheerful. A cordial person is polite and sincere in their interactions with others. A genial person is also friendly and warm-hearted.