The phrase "nothing wonder at" means that there's no need to be surprised. However, there are many synonyms for this phrase that can be used to express the same sentiment in different ways. Some of these synonyms include "no cause for amazement," "no shocker," "no biggie," "no surprise there," and "par for the course." Each of these synonyms can be used in different situations and with different levels of formality. By using these synonyms, you can add variety to your writing or speech while still conveying the same meaning. Remember that the best synonym depends on the context and your audience.