Toyonaki is a Japanese word that means "eternal youth" or "forever young." Synonyms for this word could include agelessness, youthfulness, immortality, perpetuity, and endless life. Other related terms that could be used to describe the concept of toyonaki include everlasting, timeless, infinite, and unfading. These words all convey the idea of something that does not age or deteriorate with time, and that remains vibrant and full of life indefinitely. Whether describing a person, an object, or a state of being, these words capture the essence of what it means to be toyonaki.