"More world class" is a phrase that implies a certain level of excellence or superiority. Some antonyms that can be used to describe the opposite of being world-class can include terms such as mediocre, average, unremarkable, or subpar. These words suggest that something or someone is of lesser quality or lacks exceptional or outstanding characteristics. However, it's important to note that these antonyms may not be entirely accurate or suitable in every context. The concept of being world-class is subjective and can vary depending on the field, industry, or standard being measured. Therefore, it's crucial to consider the context and implications of using specific antonyms for "more world-class.