光说不做
guāng​shuō​bù​zuò

to be all talk and no action

  1. 光 guāng adverb
    merely
    merely; solely; only
  2. 说 說 shuō verb
    to say
    to say; to speak; to talk; to express in words
  3. 不 bù 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
  4. 做 zuò verb
    to do
    To do, perform, or engage in a task or activity; to carry out work