Translation guide
Describes someone who is naturally scatterbrained, absent-minded, or ditzy in a way that seems innate and often endearing.
To describe someone who is naturally absent-minded, forgetful, or a bit silly, often in a charming or harmless way.
A common term for someone who is naturally and unintentionally funny or ditzy. '天然' means 'natural' and 'ボケ' comes from '呆ける' (to be senile/absent-minded), but here it implies a lovable airhead.
She's a natural airhead and always forgets her wallet.
Short for 天然ボケ. Used as a noun or adjective to describe someone who is naturally ditzy or clueless in a cute way.
Literally 'careless person'. Emphasizes forgetfulness and making mistakes, but can be used affectionately for someone who is a bit of an airhead.
天然ボケ implies an innate, often endearing absent-mindedness that is part of someone's personality. うっかり者 focuses more on carelessness and forgetfulness, and can be used in both affectionate and critical ways. 天然ボケ is almost always light-hearted.
あの子、ちょっと天然だよね。
That girl is a bit of a natural airhead, isn't she?
He's an airhead and often forgets appointments.
My little sister is a klutzy airhead and often knocks over cups.
He's a natural airhead, so there's no point getting angry.
That airhead lost the documents again.
Do not translate 'airhead' literally as 空気頭 or similar. These are not used in Japanese. Use the terms above depending on the nuance you want to convey.