noun
A strong desire to achieve something great, often with a neutral or positive connotation. Can also imply a self-centered drive depending on context.
彼は若い頃から政治家になる野心を持っていた。
He had the ambition to become a politician from a young age.
彼女の野心は、自分の会社を立ち上げることだ。
Her aspiration is to start her own company.
noun
sinister designs; treacherous intent
Used when ambition is seen as scheming, underhanded, or aimed at seizing power unethically. Often appears in historical or dramatic contexts.
その武将は天下を取ろうという野心を抱いていた。
The warlord harbored treacherous designs to take over the country.
彼の行動の裏には、何か野心が隠されているように思える。
It seems there is some sinister intent hidden behind his actions.