carelessness 2023.03.13 carelessnessとは 意味・定義・例文 Noun 名詞 ケらラスナス US /ˈkɛrləsnəs/ UK /ˈkeəlɪsnəs/ 1. failure to paying enough attention to what you are doing 不注意, 軽率, 無頓着, 無関心 The accident occurred because of his carelessness.