foolhardily
Definitions
In a manner that is recklessly bold or rash.
With a foolish disregard for danger or consequences.
Examples
He foolhardily attempted to climb the icy mountain without any professional climbing gear.
The young investor foolhardily put all of his savings into a single, unproven startup company.
Synonyms
recklessly rashly impulsively audaciously precipitously daringly thoughtlessly
Antonyms
cautiously prudently carefully warily thoughtfully deliberately circumspectly