‘希世’ (xī shì) is an elegant, literary adjective meaning 'rare in the world' or 'extraordinary'—so uncommon that it stands out globally or historically. The character 希 means 'rare' or 'scarce', while 世 means 'world', 'generation', or 'age'; together, they convey something uniquely exceptional across time and space. It’s often used to describe objects, talents, people, or natural phenomena of extraordinary rarity and value.

This term carries a formal, classical tone and appears frequently in literature, art criticism, historical texts, and nature writing—especially when highlighting exceptional specimens like a white peacock, a centuries-old tree, or a legendary artisan’s work. It’s not used in casual speech; instead, it elevates descriptions with gravitas and reverence, suggesting near-mythical status. Learners should note that ‘希世’ functions attributively before nouns (e.g., 希世珍宝) and rarely stands alone as a predicate.