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.
그의 생각없음이 그의 친구를 무시당하고 슬프게 만들었다.