The term "warmed-over" refers to something that is stale, dull, or uninteresting. In linguistics, antonyms are words that have opposite meanings. For "warmed-over," some antonyms include fresh, new, exciting, vibrant, and invigorating. Fresh implies a state of being new, recently made, or not previously used. New means recently made or discovered, or an introduction of something previously unheard of. Exciting suggests something full of interest, energy, or even danger. Vibrant suggests liveliness, brightness, energy, or vividness. Finally, invigorating implies a renewal of energy or strength. Using such antonyms can help to give your language more color and nuance in your writing and speech.