能天気

のうてんき· also ノーてんき

laid-back; carefree; easygoing; thoughtless

Also written 能転気、脳天気、ノー天気

Meanings

Na-adjective, Noun
laid-back; carefree; easygoing; thoughtless; happy-go-lucky

Example sentences

能天気のうてんきなやつめ。

You're happy-go-lucky.