Un-lively is an adjective that describes something or someone lacking in energy, enthusiasm, or liveliness. The antonyms for this word could be vibrant, lively, energetic, buoyant, lively, peppy, vivacious, sparkling, animated, enthusiastic, and fervent. Fervent describes someone with a strong or intense emotion, while peppy refers to someone lively and bouncy in character. Vivacious describes someone with a sparkling and energetic persona, while buoyant refers to someone with a cheerful and optimistic spirit. Sparkling, on the other hand, describes something vibrant or sparkling with energy, and animated describes someone lively and full of spirit. Nonetheless, all these words are the exact opposite of un-lively.