Meaning & Definition
adjective
Rushing or hasty; characterized by a lack of caution.
His headlong decision to quit his job surprised everyone.
Moving quickly and dangerously.
The headlong rush of the river posed a threat to the nearby village.
adverb
In a rush; in a hasty and careless manner.
He ran headlong into the busy street without looking.
Without deliberation or consideration.
She dived headlong into the project, eager to make her mark.
Etymology
Middle English, 'hedlong' meaning 'head first'.
Common Phrases and Expressions
headlong rush:
A rapid and often reckless movement.
headlong into:
Entering into something without preparation or consideration.
headlong dive:
A steep or reckless plunge.
Slang Meanings
Jump in without thinking.
He went headlong into that relationship.
Take a big risk impulsively.
She jumped headlong into investing her savings.