能天気

• 読み: のうてんき
• ローマ字: nōtenki
• 漢字の分解: 能 (nō) — ability, talent (used phonetically here); 天 (ten) — sky, heaven; 気 (ki) — spirit, mood
• 発音: /no̞ːte̞ŋki/

意味

Carefree; happy-go-lucky; thoughtless. Describes someone blithely unconcerned with problems or consequences.

A na-adjective with a mildly critical nuance — it can be used affectionately or dismissively depending on context. The person described as 能天気 is not worried in situations that call for worry, often to the frustration of others. More colloquial than formal; common in everyday speech.

例文

1. 周りが必死に働いているのに、彼だけ能天気に笑っていた。
2. そんな能天気なことを言っている場合ではないだろう。
3. 彼女の能天気な性格が、張り詰めた職場の空気をほぐすこともある。

使い方ガイド

場面: everyday conversation, workplace, character description

トーン: mildly critical

起源と歴史

Believed to derive from 脳天気 (nōtenki), combining 脳天 (the top of the head, used colloquially for the brain) with 気 (mood, spirit) — suggesting someone whose head is filled only with pleasant air. The 能 kanji form is a folk reanalysis.

文化的背景

時代: Modern

世代: All ages

社会的背景: Universal