careless; neglect;negligence; relax one’s vigilance ? 我看秦德貴要是～，他一定會(huì)承認(rèn)的。(艾蕪《百煉成鋼》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：不細(xì)心。形容粗心，麻痹大意。be neglectful and careless, relax vigilance against, carelessness