The word "uneffusive" means not demonstrating or expressing emotion or enthusiasm in a restrained manner. Antonyms for this word could include words like "enthusiastic," "animated," "expressive," "ebullient," "vivacious," and "bubbly." These are all words that connote a sense of emotion and energy, indicating that the opposite of "uneffusive" would be someone who is lively, passionate, or excitable. While uneffusive individuals may be more reserved or introverted, those who are effusive are likely to be outgoing and extroverted. It's important to note that the antonyms for "uneffusive" may also depend on context, as some situations may call for more restrained or subdued emotions.