thoughtlessness
🇺🇸
/ˈθɔːtləsnəs/
🇬🇧
/ˈθɔːtləsnəs/
Not thinking or worrying about how your actions or words might affect others.
His thoughtlessness made his friend feel ignored and sad.
他的粗心大意让他的朋友感到被忽视和悲伤。