Idiot means a stupid moron with no life. But it also means peculiar.
An idiot (scientific name: Idioticus stupidicus) is a stupid person, need I say more?
Idiot: ThE EaRtH Is FlAt!!!!!!!!!!!!
Any normal person: *facepalms*
A person who acts without little thought or care.
I may be an idiot, but indeed I am no fool.
A person who bought toilet paper during the lockdown instead of buying food they are probably gonna starve to death because they don’t use common sense.
That idiot is probably eating the toilet paper he wasted his money on.