Multi-answer boxes as radio buttons

Hello all,

In a perfect world, radio buttons would be uncheckable. Seeing as they are not, is there any way to make multi-answer boxes (with exclusion) look like radio buttons?

I have seen some answers that address similar questions by saying "javascript," or "custom theme." These answers weren't much more specific than that and so we are seeking other answers or more specifics.

Any help would be appreciated!

Thanks,
Austin