Example : Made a hasty exit.
A headlong rush to sell.

Synonyms : hasty

Example : A headfirst plunge down the stairs.
A headlong dive into the pool.

Synonyms : headfirst

Example : The runner slid headlong into third base.

Synonyms : headfirst

Example : Burst headlong through the gate.

Synonyms : precipitately

Example : He fell headlong in love with his cousin.

Synonyms : rashly