The phrase "most idiotproof" is a colloquial term used to describe something that is incredibly easy to use or understand. Synonyms for this term could include foolproof, simple, effortless, intuitive, user-friendly, straightforward, uncomplicated, or easy to comprehend. These terms each carry slightly different connotations, with "foolproof" suggesting that a product or process is completely impervious to human error, while "user-friendly" suggests that a technology has been specifically designed to be accessible to non-experts. Overall, each of these synonyms conveys the sense that something is exceptionally easy to use, and therefore well-suited to those of us who are not especially tech-savvy.