孟浪从事

Origin and story

This phrase combines menglang, rash or ill-considered, with congshi, to act or undertake something. The word 孟浪 appears in the Zhuangzi's Qi Wu Lun in a discussion of remarks considered extravagant or insufficiently grounded. That is evidence for the older word, not proof that the full four-character expression originated in that passage.

The complete phrase is documented in later writing, including Qing administrative warnings against acting precipitately. No particular founding anecdote is securely established by these sources. Its focus is the quality of a decision: action taken without adequate thought or preparation. It is usually a criticism or warning, rather than a compliment for speed or boldness.