careless; neglect;negligence; relax one’s vigilance ❍ 我看秦德贵要是～，他一定会承认的。(艾芜《百炼成钢》142) From the way I look at it,if Qin Degui were just careless,he would certainly have acknowledged his fault.
疏忽大意shū hū dà yì
疏忽：不细心。形容粗心，麻痹大意。be neglectful and careless, relax vigilance against, carelessness