More ardorless means lacking passion or enthusiasm. There are several synonyms for the word including spiritless, dull, lackluster, lifeless, unanimated, uninspired, apathetic, and indifferent. Spiritless refers to something that lacks vitality or energy, while dull means lacking excitement or interest. Lackluster refers to something that is dull or uninspired, and lifeless refers to something that is devoid of energy or vitality. Unanimated refers to something that lacks animation or excitement, while uninspired means lacking inspiration or creativity. Apathetic refers to someone who lacks interest or enthusiasm, and indifferent refers to a lack of passion or concern. All of these synonyms can be used interchangeably with more ardorless.