形容詞 impulsive:

1. proceeding from natural feeling or impulse without external stimulus
   同義詞：unprompted
2. without forethought
3. having the power of driving or impelling
   同義詞：driving
4. determined by chance or impulse or whim rather than by necessity or reason
   同義詞：capricious, whimsical
5. characterized by undue haste and lack of thought or deliberation; (`brainish' is archaic)
   同義詞：hotheaded, impetuous, madcap, tearaway, brainish

1. Such impulsive acts as hugging strangers; impulsive generosity.
   比如擁抱陌生人這種沖動(dòng)的舉止; 一時(shí)沖動(dòng)的慷慨大方
2. A hand tool used to exert an impulsive force by striking, consisting of a handle with a perpendicularly attached head made of a relatively heavy, rigid material.
   錘子一種通過(guò)敲擊發(fā)出沖擊力的工具，包括一個(gè)把手和一個(gè)與之垂直的由較沉、較重的金屬制成的頭
3. He was, on his own admission, impulsive by nature.
   他承認(rèn)自己生性易于感情沖動(dòng)。
4. Capable of calmly awaiting an outcome or a result; not hasty or impulsive.
   耐心的，不沖動(dòng)的能平靜等待后果或結(jié)果的; 不急的或不沖動(dòng)的

im.pul.sive

adj.（形容詞）
Inclined to act on impulse rather than thought.
易沖動(dòng)的：傾向于沖動(dòng)行事而不深思熟慮的
Motivated by or resulting from impulse:
沖動(dòng)造成的：由于沖動(dòng)引發(fā)或造成的：
例句：
such impulsive acts as hugging strangers; impulsive generosity.See Synonyms at spontaneous
比如擁抱陌生人這種沖動(dòng)的舉止；一時(shí)沖動(dòng)的慷慨大方參見(jiàn) spontaneous

Having force or power to impel or incite; forceful.
驅(qū)動(dòng)的，推進(jìn)的：有力量或權(quán)力驅(qū)使或煽動(dòng)的；有力的
Physics Acting within brief time intervals. Used especially of a force.
【物理學(xué)】 沖擊的：短期內(nèi)做出的行為。特別是在一種力量的驅(qū)使下

【引伸】
impul.sively
adv.（副詞）
impul.siveness 或
im.pulsiv.ity
n.（名詞）