坦

坦 (Kangxi radical 32, 土+5, 8 strokes, cangjie input 土日一 (GAM), four-corner 4611₀, composition ⿰土旦)

• 𢯟, 𥂯

• Kangxi Dictionary: page 226, character 18
• Dai Kanwa Jiten: character 4971
• Dae Jaweon: page 461, character 30
• Hanyu Da Zidian (first edition): volume 1, page 431, character 3
• Unihan data for U+5766

Phono-semantic compound (形聲 / 形声, OC *tʰaːnʔ) : semantic 土 (“earth”) + phonetic 旦 (OC *taːns)

坦

1. ^⁜ flat; level; wide

   平坦  ―  píngtǎn  ―  level

2. ^⁜ calm; open-hearted; at ease

   坦然  ―  tǎnrán  ―  calm

   • 子曰：「君子坦蕩蕩，小人長戚戚。」 [Classical Chinese, trad.]
     子曰：「君子坦荡荡，小人长戚戚。」 [Classical Chinese, simp.]

     From: The Analects of Confucius, c. 475 – 221 BCE, translated based on James Legge's version

     Zǐ yuē: “Jūnzǐ tǎn dàngdàng, xiǎorén cháng qīqī.”

     The Master said, "The superior man is satisfied and composed; the mean man is always full of distress."

3. ^⁜ honest; frank

   坦白  ―  tǎnbái  ―  honest; candid

   Synonym: 直率 (zhíshuài)

4. ^† to reveal; to expose

   • 坦腹江亭暖，長吟野望時。 [Classical Chinese, trad.]
     坦腹江亭暖，长吟野望时。 [Classical Chinese, simp.]

     From: 杜甫 (Du Fu) 《江亭》

     Tǎn fù jiāng tíng nuǎn, cháng yín yě wàng shí.

     (please add an English translation of this usage example)

5. a surname

• “坦”, in 漢語多功能字庫 (Multi-function Chinese Character Database)‎, 香港中文大學 (the Chinese University of Hong Kong), 2014–

(Jinmeiyō kanji)

1. flat; level; even

• Go-on: たん (tan)
• Kan-on: たん (tan)
• Kun: たいら (taira, 坦ら)
• Nanori: しずか (shizuka)、ひろ (hiro)、ひろし (hiroshi)、ひろむ (hiromu)、やす (yasu)、ゆたか (yutaka)

From Middle Chinese 坦 (MC thanX).

Korean Wikisource has texts containing the hanja:

坦

Wikisource

坦 (eumhun 평평할 탄 (pyeongpyeonghal tan))

1. hanja form^? of 탄 (“flat; level; even”)

• 국제퇴계학회 대구경북지부 (國際退溪學會 大邱慶北支部) (2007). Digital Hanja Dictionary, 전자사전／電子字典.

坦: Hán Việt readings: thản (儻(thảng)旱(hạn)切(thiết))^{[1][2][3][4][5]}, thán^[5]
坦: Nôm readings: đứt^{[1][2][3][6][4][5][7]}, đất^{[1][2][3][4][5][7]}, đắt^{[2][3][6][4][5][7]}, thản^[2][6][4], đác^[1], đởn^[1], thán^[1], đắn^[2], đật^[3], ngẩn^[3], thưỡn^[3]

坦 (thản)

1. chữ Hán form of thản (“flat; level; wide”).
2. chữ Hán form of thản (“calm; pleasant”).

Phono-semantic compound (形聲 / 形声) : semantic 土 (“earth”) + phonetic 怛 (đát). The 旦 element is a simplified form of 怛.

坦 • (đất)

1. Nôm form of đất (“earth; soil; dirt”).
2. Nôm form of đất (“land”).

• 𡐙 (đất),^[3] 待 (đất)^[3]

坦 • (đứt)

1. Nôm form of đứt (“to break off; to be cut off”).