Japanese by Example
Learning through examples in manga

Carefree with 呑気

呑気(のんき) is being carefree or careless. Relaxed and easygoing.

Dictionary Definition

性格や気分がのんびりとしていること。こせこせしないこと。

One's character and mood are in a relaxed manner. Not being anxious.

Goo Dictionary

Examples

Careless until graduation with 呑気

アオハライド » Volume 13 » Page 18

Aya has mostly given up hope of attracting Shuko’s interest away from their teacher, Mr. Tanaka. Tanaka, having no interest in pursuing a relationship with a student, pushes for Aya to keep trying before the situation changes.

田中(たなか):
呑気(のんき)にしてるとあっという()卒業(そつぎょう)だぞ」
“If you act carelessly, it'll be graduation before you know it.”

The に after 呑気(のんき) makes it an adverb.

No time to leisurely eat with 呑気

美少女戦士セーラームーン » Volume 8 » Page 58

After an enemy attack changes Usagi and Mamoru into kids, Usagi wakes to find the two of them living together as a couple.

As Usagi wanders into the dining room, Mamoru is placing a plate of french toast on the table. He greets her and asks Usagi what type of jam she wants on her toast.

Usagi responds, then realizes she needs to get to school.

うさぎ:
「あたし ライムのマーマレードッ」
“I'll have lime marmalade!”
「ってそんな呑気(のんき)()べてるヒマなんかあたしにはっっ」
“Ah, I don't have any time to be leisurely eating!”

The に after 呑気(のんき) makes it an adverb.