The phrase "not germane" means that something is not relevant or applicable to the subject at hand. Some antonyms for this phrase include "pertinent," "relevant," "appropriate," "related," and "connected." These words indicate that something is closely tied to the topic being discussed and is important to consider. Other antonyms for "not germane" might include "irrelevant," "unrelated," "inapplicable," "immaterial," or "extraneous." These words suggest that something is not related to the matter under discussion and does not add any value to the conversation. Choosing the right word to indicate relevance or irrelevance can help improve communication and make discussions more productive.