What term is used to indicate that there was no clear response from a witness?

The term that accurately describes a situation where there was no clear response from a witness is "unresponsive." When a witness is unresponsive, it means that they have not provided an answer to a question that can be discerned as relevant or coherent. This term is commonly used in legal contexts to signify that the witness has failed to address the question posed, thereby leaving ambiguity about their statement.

In contrast, "indiscernible" refers to something that cannot be understood or made out, often used in a context where the information is unclear rather than non-existent. "Inaudible" specifically describes sound that cannot be heard, which would not inherently imply a lack of a response but rather an issue with sound transmission. "Silent" suggests that the witness simply did not speak, which may not accurately convey the complexity of the situation if they were expected to respond but did not. Overall, "unresponsive" best captures the essence of a witness failing to provide a clear or adequate reply.