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recklessness in doing sth
这里的 in doing sth 表示在某具体行为上表现出的鲁莽。
His recklessness in spending money soon led to debt.
他花钱时的鲁莽很快就导致了债务。
鲁莽；粗心大意
先理解核心含义，再看它在真实句子里的用法。
鲁莽；粗心大意
the trait of giving little thought to danger
His recklessness in spending money soon led to debt.
他花钱时的鲁莽很快就导致了债务。
鲁莽、轻率或不必要的冒险状态或品质。
The state or quality of being reckless or heedless, of taking unnecessary risks.
His recklessness on the icy road caused him to lose control of the car.
他在结冰路面上的鲁莽行为导致他失去了对汽车的控制。
After the accident, the driver was arrested for recklessness and fined heavily.
事故发生后，司机因鲁莽驾驶被捕并被处以重罚。
Her friends were worried that her recklessness would one day get her into serious trouble.
她的朋友们担心她的鲁莽有一天会让她惹上大麻烦。
这里的 in doing sth 表示在某具体行为上表现出的鲁莽。
His recklessness in spending money soon led to debt.
他花钱时的鲁莽很快就导致了债务。
with recklessness 相当于副词 recklessly，在正式语体中较常见。
The driver swerved through traffic with recklessness.
那名司机鲁莽地在车流中穿行。
an act of recklessness 用于指某一具体鲁莽行为。
Leaving the child alone in the car was an act of recklessness.
把孩子独自留在车里是一种鲁莽行为。
Not this
He is recklessness.
Use this
He is reckless.
recklessness 是名词，意为“鲁莽”；在 be 动词后作表语表示“他是鲁莽的”时，应使用形容词 reckless。
Not this
He drove recklessness.
Use this
He drove recklessly.
drove 是动词，需要副词来修饰动作；recklessness 是名词，不能修饰动词，其副词形式是 recklessly。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
鲁莽行为
He lost his license because of an act of recklessness.
他因一次鲁莽行为被吊销了驾照。
十足的鲁莽；完全不计后果
Sheer recklessness led the teenagers to climb onto the roof at night.
十足的鲁莽使这些少年在夜里爬上了屋顶。
犯罪性鲁莽；刑法上的轻率
The company's criminal recklessness endangered thousands of residents.
该公司犯罪性的鲁莽行为危及了数千名居民。
年轻气盛的鲁莽；年轻人的轻率
The judge blamed the vandalism on the recklessness of youth and gave the boys a warning.
法官认为这起破坏行为是年轻气盛的鲁莽所致，只对男孩们给予警告。
肆无忌惮的鲁莽
The referee condemned the player's wanton recklessness and sent him off the field.
裁判谴责了那名球员肆无忌惮的鲁莽行为，将他罚下场。
财务上的恣意妄为；轻率的金融行为
The bank collapse was caused by years of financial recklessness.
这家银行的倒闭是多年财务上恣意妄为造成的。
Use recklessness naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
reckless（鲁莽的）+ ness（名词后缀）→ 鲁莽、粗心大意。想象 reckless 的人“reck”一声冲出去，完全不顾危险。
语域：mixed 常见场景：日常书面语与口语、法律文书或正式讨论 该词总体为中性，日常写作和口语中均较常用；在法律语境中则偏正式。多用于描述不计后果的行为或态度，通常带批评意味。
这些词都以 -lessness 结尾，拼写相似，但重音元音各不相同，因此都不与 recklessness (/'rɛkləsnəs/) 押韵；它们唯一的共同发音是词尾轻读的 /ləsnəs/。注意 carelessness (/'kɛərləsnəs/) 和 uselessness (/'juːsləsnəs/) 等拼写相似，但发音不同。
Dictionary facts from ECDICT, WIKTIONARY.