be a harum-scarum
harum-scarum 作为可数名词，指‘冒失的人’
He is a harum-scarum.
他是个冒失鬼。
轻浮鲁莽的人；粗心的人；粗心；鲁莽行为
轻浮鲁莽的人
A giddy, rash person.
He is a complete harum-scarum, always diving into trouble without thinking.
他完全是个冒失鬼，总是不假思索地惹上麻烦。
用法提示：此处harum-scarum为名词，指代一个鲁莽的人。
That was a real harum-scarum; you could have been hurt.
那真是个鲁莽的行为，你本可能受伤的。
用法提示：此处harum-scarum为名词，指称一种轻率的行为。
His harum-scarum often gets him into trouble at work.
他的鲁莽经常让他在工作中惹麻烦。
用法提示：此处harum-scarum为名词，指鲁莽的习性。
harum-scarum 作为可数名词，指‘冒失的人’
He is a harum-scarum.
他是个冒失鬼。
用于警告或劝告他人不要鲁莽
Don't act like a harum-scarum.
别像个冒失鬼一样。
harum-scarum 作为不可数名词，指‘鲁莽的行为’
The plan was full of harum-scarum.
这个计划充满了鲁莽。
scatterbrain 指因注意力不集中而粗心的人，harum-scarum 强调鲁莽冒失，而非心不在焉。
madcap 指行事疯狂、不顾后果的人，语气更强；harum-scarum 侧重轻率、缺乏考虑。
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