(bound form) honest; straightforward; open-hearted, as in 坦率 tǎn​shuài or 坦白 tǎn​bái

(bound form) flat; level; smooth, as in 平坦 píng​tǎn or 坦途 tǎn​tú

(bound form) calm; composed; at ease, as in 坦然 tǎn​rán or 舒坦 shū​tan

(literary) a way to refer to a son-in-law

(abbreviation) short for 坦桑尼亚 tǎn​sāng​ní​yà

(literary) to reveal; to expose (one's chest, etc.)

a Chinese surname