headlong

形容词 headlong:

1. excessively quick
   同义词：hasty
2. with the head foremost
   同义词：headfirst

副词 headlong:

1. with the head foremost
   同义词：headfirst
2. at breakneck speed
   同义词：precipitately
3. in a hasty and foolhardy manner
   同义词：rashly

1. A headlong dive or fall.
   头朝下跳水或掉落
2. The child leaned towards his mother and fell headlong in front of her.
   孩子俯身凑向妈妈，头朝前面倒在妈妈的面前。
3. Little Marry carried on for ten minutes after she fell headlong.
   小玛丽摔了个倒栽葱后，哭闹了十分钟。
4. Don't rush headlong into danger; think it through carefully before you make any decisions.
   不要轻率地奔赴险境，做任何决定之前都要认真想想。

head.long

adv.（副词）
With the head leading; headfirst:
头部先着地地；头冲前地：
例句：
The runner slid headlong into third base.
跑垒者一头滑进了三垒

In an impetuous manner; rashly.
鲁莽地；轻率地：用鲁莽的方式地；轻率地
At breakneck speed or with uncontrolled force.
飞快地：以极快的速度或无法控制的力量地
adj.（形容词）

Done with the head leading; headfirst:
头在前完成的；头冲前的：
例句：
a headlong dive.
俯冲跳水

Impetuous; rash.See Synonyms at impetuous
莽撞的；轻率的参见 impetuous
Uncontrollably forceful or fast.
无法控制的力量或速度的
Archaic Steep; sheer.
【古语】 陡峭的；垂直的

来源：
From Middle English (bi) hedlong
源自 中古英语 (bi) hedlong
from hed, head [head] * see head
源自 hed, head [头部] *参见 head