The Chinese word **任性** (rènxìng) is a compound formed by combining two characters: **任** (rèn), meaning "to let go," "to allow," or "to indulge," and **性** (xìng), meaning "nature," "disposition," or "character." Literally, it conveys the idea of "indulging one's natural disposition" or "following one's innate impulses." Over time, this literal sense evolved into its modern meaning of "willful," "headstrong," or "self-indulgent," describing someone who acts capriciously or does whatever they want without regard for rules, consequences, or others' opinions, often with a connotation of being spoiled or unreasonable.