blithely
adv. 快活地；无忧无虑地
例句
'It'll be easy,' she said blithely.
“那很容易。”她不在乎地说。
《牛津词典》
Your editorial blithely ignores the hard facts.
你们的社论轻率地忽略了铁的事实。
《柯林斯英汉双解大词典》
He was blithely unaware of the trouble he'd caused.
他漫不经心，丝毫没有察觉他惹的麻烦。
