noun, na-adjective, noun which may take the genitive case particle 'no'
overconfident; presumptuous
Describes a person or attitude that is excessively self-assured, often crossing into arrogance or taking liberties.
彼は自信過剰で、人の意見を聞かない。
He is overconfident and doesn't listen to others' opinions.
自信過
His overconfident attitude led to failure.