口惠而實不至 [－－－实－－]

Jyutping hau2 wai6 ji4 sat6 bat1 zi3
Pinyin kǒu huì ér shí bù zhì

Definitions (CC-CANTO)
  1. verbally agreeing/ promising but without taking any actions; Good words without deed are rushes and reeds
Definitions (Wiktionary)
  1. verb
    to pay a lip service; to make an empty promise and not keep it