dà'ēn​bù​yán​xiè

mere thanks are not enough

  1. great favor
    a great act of kindness; a profound favor or debt of gratitude
  2. adverb
    not
    Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
  3. yán verbadverb
    to say
    to speak; to talk; to state or tell
  4. to thank
    to thank; to express gratitude or appreciation