Answer: Extemporaneous.
Explanation: An extemporaneous outline is a concise outline that includes the speaker's main ideas and key points, but does not include a full script or word-for-word notes. The purpose of an extemporaneous outline is to provide the speaker with a general guide for their presentation while allowing them to speak spontaneously and adapt to the needs of the audience. This type of outline is particularly useful for speeches that require a conversational tone and engagement with the audience, as it allows the speaker to maintain eye contact and make natural gestures without being overly reliant on notes.