noun
A derogatory term for a foolish person. The reading ばかもん is a colloquial or dialectal variant, often heard in rough or old-fashioned speech.
あんな馬鹿者に構うな。
Don't bother with that fool.
彼は馬鹿者呼ばわりされた。
He was called an idiot.
馬鹿 is the more common and versatile word for 'fool' or 'stupid', used as both a noun and an adjective. 馬鹿者 is a stronger, more explicit noun meaning 'foolish person' and is more insulting.
阿呆 is a Kansai-dialect term for 'fool', often less harsh than 馬鹿者 and can be used playfully. 馬鹿者 is more universally understood and carries a sharper edge.
Compound of 馬鹿 (foolish) and 者 (person). The origin of 馬鹿 is uncertain, with theories including a reference to a Chinese historical anecdote or a corruption of Sanskrit 'moha' (ignorance).