Final answer:
The vague word in the thesis statement is 'other stuff'. To improve the thesis statement, specific language should be used to describe what the mermaids prioritize over appearance.
Step-by-step explanation:
The vague word or phrase in the provided thesis statement is other stuff. The usage of the term 'other stuff' is not specific and lacks clarity as it does not define what it refers to. To improve the thesis statement, the writer should replace 'other stuff' with more precise language that clearly explains what the mermaids prioritize over appearance.
Learn more about Analysis of a thesis statement