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Jyutping bat1 wan1 bat1 fo2
Pinyin bù wēn bù huǒ

Definitions (Wiktionary)
  1. phrase, idiomatic
    to be in a happy medium state; neither hot nor cold

不溫不火 [-温--]

Jyutping
Pinyin bù wēn bù huǒ

Definitions (CC-CEDICT)
  1. (of sales, TV show ratings etc) lukewarm
  2. moderate
  3. so-so
  4. (of a person) calm
  5. unruffled