The Chinese word 愉悦 (yúyuè), meaning "joyful" or "delighted", is formed through the common lexical process of synonym compounding, where two independent characters with similar meanings are combined to create a single, reinforced concept. The character 愉 (yú) by itself conveys "pleasure" or "happiness", while 悦 (yuè) means "glad" or "pleased", often with a connotation of something that gratifies the heart. By pairing these two semantically related morphemes, the compound word 愉悦 gains a richer, more nuanced, and emphatic meaning than either character alone, effectively expressing a state of cheerful contentment and psychological satisfaction.