形容詞 impetuous:

1. characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic)
   同義詞：hotheaded, impulsive, madcap, tearaway, brainish
2. marked by violent force

1. She regretted her impetuous decision.
   她後悔自己做了沖動的決定。
2. Mr Smith has to justify a "waiting game" to his more impetuous followers.
   史密斯先生不得不向其較為沖動的追隨者證明“觀望政策”是正確的。
3. It would be foolish and impetuous to resign over such a trivial matter.
   為這樣的小事辭職未免愚蠢而輕率。
4. He is an impetuous young man.
   他是個易沖動的年輕人。

im.pet.u.ous

adj.（形容詞）
Characterized by sudden and forceful energy or emotion; impulsive and passionate.
沖動的：具有突然的和強有力的能量或感情特征的；沖動的和熱情的
Having or marked by violent force:
猛烈的，奔騰的：
例句：
impetuous, heaving waves.
奔騰洶涌的浪花

來源：
Middle English [violent]
中古英語 [猛烈的]
from Old French impetueux
源自 古法語 impetueux
from Late Latin impetuôsus
源自 后期拉丁語 impetuôsus
from Latin impetus [impetus] * see impetus
源自 拉丁語 impetus [刺激] *參見 impetus

【引伸】
impet.uously
adv.（副詞）
impet.uousness
n.（名詞）
<參考詞匯><同義詞>impetuous,heedless,hasty,headlong,precipitate,suddenThese adjectives describe people and their actions when they are marked by abruptness or lack of deliberation.
這些形容詞描述魯莽或缺乏謹(jǐn)慎的人以及這時的行為。
Impetuous suggests forceful impulsiveness or impatience:
Impetuous 意味著強烈的沖動和不耐心；
例句：
.[a race driver who was] flamboyant, impetuous, disdainful of death. (Jim Murray).
.［一個賽車手］ 輝耀的，沖動的，對死亡充滿蔑視的人 （吉姆·默萊）。

Heedless implies carelessness or lack of a sense of responsibility or proper regard for consequences:
Heedless 含有粗心的、沒有責(zé)任感的或不考慮后果的意思：
例句：
.Hobbling down stairs with heedless haste, I set my foot full in a pail of water. (Richard Steele).
.魯莽地匆匆蹦跳著下了樓梯，我把雙腳全部泡進了水桶里. （里查德·斯蒂爾）。

Hasty andheadlong both stress hurried, often reckless action:
Hasty 和headlong 都強調(diào)匆忙的， 經(jīng)常是不計后果的行動：
例句：
.Hasty marriage seldom proveth well. (Shakespeare).
.草率的婚姻很少有好結(jié)果. （莎士比亞）。

例句：
The soldiers made a headlong rush for cover.
士兵們不顧一切沖向掩蔽所。

Precipitate suggests impulsiveness and lack of due reflection:
Precipitate 意思是沖動和缺乏應(yīng)有的考慮：
例句：
.Some of the fickle populace began to doubt whether they had not been rather precipitate in deposing his brother. (Washington Irving).
.一些多變的人開始懷疑他們把他的兄弟廢除掉是不是太不考慮后果了. （華盛頓·歐文）。

Sudden applies to what becomes apparent abruptly or unexpectedly:
Sudden 用于變得突然或出乎意料明顯的事物：
例句：
The patient is given to sudden and inexplicable paroxysms of anger.
病人突然且無法解釋地憤怒發(fā)作起來。