When it comes to expressing an intense feeling of embarrassment or discomfort, the term "toe-curling" does a great job. However, if you're looking for other words to convey a similar sentiment, there are plenty of options to consider. One could use words like cringe-worthy, mortifying, or nerve-wracking to describe an experience that causes discomfort or embarrassment. Similarly, the phrase "makes my skin crawl" can be used to convey a sense of revulsion or disgust. Alternatively, you might choose to describe a situation as "awkward" or "unsettling", depending on the specific circumstances. Regardless of the words you choose, they should help to convey the visceral emotional response associated with toe-curling experiences.