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Jyutping wan1 tan1
Pinyin wēn tūn

Definitions (Wiktionary)
  1. adj, of a person
    slow and passive; unenthusiastic
  2. adj
    lukewarm; neither hot nor cold
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

溫吞 [温-]

Jyutping
Pinyin wēn tūn

Definitions (CC-CEDICT)
  1. tepid; lukewarm
  2. (fig.) apathetic; half-hearted; sluggish
  3. mild-tempered