不知轻重

Explanation: Weight: weight size. The unreasonable one persists, take the liberty to act 　　Usage: Verb-object type; the predicate; described the venture to act 　　Source: Lu Pu-wei Qin Warring States "Lu Jataka": "the people present, doubts and raised more than sexual objects, then I do not know the severity as well. I do not know the severity of the serious cases to light, the light to heavy carry on." 　　Examples: Old Woman who ~, said that some patients two days, fear not like to ask the doctor here. (Qing Cao Xueqin's "Dream of Red Mansion" back nine first 0) Thesaurus:  Act recklessly, guiltless interest, not knowing whether to advance or retreat, guiltless deep, guiltless accident, Primary calf, have an exaggerated opinion of one's abilities as one who does not know the immensity of heaven and earth, Do not know the level of, be very promising Antonym Group:  Reasonable notice, Reasonable notice of