upstartism

uncountable

The behaviour or attitudes of an upstart.

Japanese Meaning

新進者が示す、しばしば横柄で傲慢な態度や行動 / 急速に出世した人特有の、自己中心的な振る舞い

The committee dismissed his upstartism, insisting that respect and seniority mattered more than his brash proposals.

委員会は彼の成り上がり者の横柄さを退け、尊敬や年功が彼の生意気な提案より重要だと主張した。

Sense（1）

The behaviour or attitudes of an upstart.