むむ
  interjection (kandoushi)
  onomatopoeic or mimetic word
  hum
  hmm
  mild surprise or doubt
  see: ふふ
  onomatopoeic or mimetic word
  mm mm
  light chuckle with mouth closed
  see: うんうん
  onomatopoeic or mimetic word
  mm mm
  agreeable sounds (sound indicating agreement)
  onomatopoeic or mimetic word
  mm
  hmm
  deep in thought
  onomatopoeic or mimetic word
  well
  calling attention
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