Languorousnesses is not a widely used word, but some synonyms could be lethargy, sluggishness, lassitude, torpor, or a lack of energy. It may also mean a feeling of tranquility or relaxation, in which case synonyms could be ease, calmness, serenity, or peacefulness. However, it is important to note that these synonyms do not necessarily mean the same thing as languorousnesses, as each word has its own distinct connotation and definition. Therefore, it is best to use the most appropriate synonym depending on the intended meaning and context of the sentence.