Un-sympathizing is the opposite of being compassionate and understanding towards others. The antonyms for this word are numerous, and they exist in various forms, including nouns, verbs, and adjectives. Some of the antonyms for un-sympathizing include empathetic, sympathetic, understanding, compassionate, caring, kind, considerate, thoughtful, and tenderhearted. Other related terms that express the opposite of un-sympathizing are merciful, charitable, sensitive, and generous. These words describe people who possess an innate ability to feel and comprehend the pain and struggles of others, and they are always ready to lend a helping hand towards the less fortunate.