fatuously

IPA(Pronunciation)

Adverb

With smug stupidity or vacuous silliness; idiotically.

Japanese Meaning

自惚れた愚かさや、空虚な滑稽さを伴って馬鹿げた行動をするさま。 / 考えなしに、ばかげた振る舞いをする状態。

He fatuously dismissed every concern, smiling as if nothing could go wrong.

彼はすべての懸念をうぬぼれた愚かさで一蹴し、何も問題が起きないかのように微笑んでいた。

Sense（1）

With smug stupidity or vacuous silliness; idiotically.

more fatuously

（ comparative ）

most fatuously

（ superlative ）