言而不行
yán'ér​bù​xíng

all talk and no action

  1. 言 yán verbadverb
    to say
    to speak; to talk; to state or tell
  2. 而 ér conjunction
    but
    Used to connect ideas that contrast or conflict; yet; but; on the other hand
  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. 行 xíng verb
    to do
    to do; to perform; to carry out; to engage in