unthinker

Noun

One who does not think, or does not think wisely.

Japanese Meaning

考えない人 / 十分に考えず、軽率な判断を下す人 / 思慮に欠ける人

Calling him an unthinker during the meeting was harsher than necessary, but his careless decision cost us dearly.

会議中に彼を思慮のない人と呼ぶのは必要以上に厳しかったが、彼の軽率な判断が大きな損失を招いた。

Sense（1）

One who does not think, or does not think wisely.

unthinkers

（ plural ）