充分 (chōng fēn) is an adjective meaning 'sufficient' or 'adequate', indicating that something meets a required or desired level—neither lacking nor excessive. The character 充 (chōng) conveys 'full', 'fill', or 'abundant', while 分 (fēn) here functions as a measure or degree marker, reinforcing completeness—not to be confused with the noun 'part' or verb 'to divide'. Together, they express the idea of 'fully meeting a standard'.

This word is commonly used in formal and semi-formal contexts: health advice ('充分休息' — get sufficient rest), academic writing ('充分证据' — sufficient evidence), and daily planning ('时间是否充分？' — Is there enough time?). It often modifies nouns directly or appears after verbs like '有' or '具备' (e.g., '有充分理由'). While it can occasionally function adverbially (e.g., '充分考虑'), its primary role is adjectival, and it rarely stands alone as a noun or verb.