An idiot (scientific name: Idioticus stupidicus) is a stupid person, need I say more?
Idiot: ThE EaRtH Is FlAt!!!!!!!!!!!!
Any normal person: *facepalms*
someone who uses the word "retard" as a synonym for idiot.
A: "idiot means retard."
B: "no it doesn't, are you brain dead?"
A word to call someone who doesn't know the meaning of life, it's obviously 42.
That idiot doesn't know what like is all about! Haha!
You.
Idiot = the human reading this. (At least I hope you’re a human)