When someone feels disheartened, they are discouraged or demoralized. Opposite to that, words like "encourage," "inspire," or "motivate" can boost one's morale and make them feel positive. A person who is not disheartened can be described as "hopeful," "optimistic," or "confident." These antonyms can be useful in uplifting someone's spirits and encouraging a can-do attitude. Sometimes, a little bit of encouragement and positive feedback can make all the difference in someone's life. Therefore, it's essential to use words that inspire rather than dampen one's spirit.