Light-heartednesses refers to the state of being carefree, playful, and cheerful. The term antonym denotes a word that means the opposite of another word, which means antonyms for light-heartednesses are words that express seriousness, gloominess, and sadness. Some antonyms for light-heartednesses are depression, gloom, sorrow, melancholy, gravitas, solemnity, and seriousness. These words express the opposite of the joy and vivacity associated with light-heartednesses. While light-heartednesses often conveys happiness, antonyms like solemnity, grave, and serious express a sense of gravity, thoughtfulness, or tension. Expounding on antonyms, therefore, provides greater precision in written and spoken language communication.