Translation guide
The quality of being recklessly bold or rash, often without considering the consequences. In Japanese, this concept is expressed through nouns, adjectives, and idiomatic phrases that emphasize thoughtless courage or dangerous overconfidence.
Describing the trait of acting boldly without regard for danger or consequences.
The most direct and common noun for 'foolhardiness' or 'recklessness'. Often used in phrases like 無謀な挑戦 (a reckless challenge).
彼の無謀な運転は事故を引き起こした。
His foolhardy driving caused an accident.
A slightly colloquial noun/adjective meaning 'reckless' or 'daredevil'. Implies a lack of caution, often used for people or actions.
あの若者は無鉄砲で、いつも危険なことに挑戦する。
That young man is foolhardy and always takes on dangerous challenges.
Literary term for 'foolhardy courage' or 'reckless bravery'. Often used in formal or written contexts to criticize thoughtless valor.
蛮勇を奮って敵陣に突入するのは愚かだ。
It is foolish to charge into the enemy camp with foolhardy courage.
Focusing on the lack of forethought or consideration of danger.
An adverbial phrase meaning 'without thinking of the consequences'. Used to describe actions done impulsively and recklessly.
彼は後先考えずに全財産を投資した。
He invested all his money without thinking of the consequences.
An adjective meaning 'foolhardy' or 'reckless', literally 'not seeing the other side'. Emphasizes blindness to danger.
向こう見ずな行動はやめたほうがいい。
You should stop such foolhardy behavior.
Describing a state of being overly confident leading to carelessness.
A descriptive phrase meaning 'overconfident and reckless'. Combines the idea of excessive self-confidence with foolhardiness.
自信過剰で無謀な計画は失敗するに決まっている。
An overconfident and foolhardy plan is bound to fail.
A four-character idiom meaning 'rushing recklessly forward'. Often used to describe someone who charges ahead without caution.
彼の猪突猛進な性格が災いして、プロジェクトは失敗した。
His foolhardy, headstrong nature caused the project to fail.
無謀 is the standard word for 'recklessness' and can be used in formal contexts. 無鉄砲 is more colloquial and often describes a person's character as 'daredevil' or 'foolhardy' in a slightly less severe tone.
There is no single Japanese word that perfectly matches 'foolhardiness' in all contexts. Using 愚かさ (foolishness) alone misses the 'boldness' aspect. Instead, use the options above depending on the nuance.