One word for something

naive
ignorant
illiterate

Hi enoon, thanks for your input.
If one is ignorant of anything in computer, you call him/her a computer what?

He is a computer illiterate.

Illiterate is a bit too literary, do you have a word that's more casual?

RobinGIlliterate is a bit too literary, do you have a word that's more casual?

That's what it's called. This "illiterate" is not at all literary. It does not mean that you can't read, which is actually a fairly recently developed meaning of the word. It means that you are not well read on whatever subject.

I think OP meant too literary as in too formal or fancy, thus the asking for a more casual word.

I'm not sure there is a more casual word, though. Ignorant is probably good. He's completely ignorant about music.

musically-challenged? slightly too offensive?

AnonymousI think OP meant too literary as in too formal or fancy, thus the asking for a more casual word.

I guess you could say he's a computer dummy.

Hi stranger thanks for your thoughts. What do you mean by 'OP'?

OP - Opening Post or Opening Poster