self-important

Adjective

Having, or behaving as if having, too high of an opinion of one's own importance.

Japanese Meaning

自分を過剰に重要だと考え、またはそのように振る舞うこと

He grew self-important after his promotion, treating his former colleagues with condescension.

昇進してから彼は偉そうになり、以前の同僚たちに対して見下した態度を取った。

Sense（1）

Having, or behaving as if having, too high of an opinion of one's own importance.

The assistant manager was a self-important fellow who strutted about the office barking instructions.

more self-important

（ comparative ）

most self-important

（ superlative ）