tactless
adj. 不机智的；不老练的；笨拙的
例句
He can be very tactless sometimes.
他有时太莽撞。
《牛津词典》
It was tactless of you to comment on his hair!
你竟对他的头发说三道四，真是缺心眼！
He had alienated many people with his tactless remarks.
他说话没轻没重，疏远了许多人。
《柯林斯英汉双解大词典》
