坦率 (tǎn shuài) is an adjective meaning 'candid' or 'straightforward' — describing someone who speaks openly, honestly, and without concealment or pretense. The character 坦 means 'level', 'open', or 'unobstructed', evoking clarity and lack of barriers; 率 means 'direct', 'unrestrained', or 'spontaneous', suggesting naturalness and absence of calculation. Together, they form a compound that emphasizes sincerity in expression — not just honesty, but the willingness to share thoughts frankly, even when uncomfortable.

This word is commonly used to describe people, communication styles, or remarks in personal, professional, or diplomatic contexts. It carries a generally positive connotation, implying integrity and trustworthiness, though it can occasionally imply bluntness if tone or context lacks tact. 坦率 is more formal and literary than colloquial alternatives like 直接 (zhí jiē) and often appears in written Chinese, speeches, or thoughtful conversation about interpersonal dynamics.