extemporaneous

Kennedy realizes he’s got to go on television and preempt Wallace, and he does so and gives a largely extemporaneous speech, in which he elevates the civil rights movement to a moral issue.

His voicemails sometimes went on for several minutes in flawless extemporaneous prose.

But extemporaneous speech is not his strongest suit; Kanye expresses himself much better creatively than he does in conversation.

He is a very bright man and that came through loud and clear in his 45-minute nearly extemporaneous talk.

He must possess native talent, a clear insight of human character, agreeable address, extemporaneous powers of speech.

Inn-yards, houses without roofs, and extemporaneous enclosures at country fairs were the ready theatres of strolling players.

There is no such thing as extemporaneous acquisition, as Webster himself said of his speech.

Thomas orchestra (which happened to be aboard) give them an extemporaneous concert.

The advantages of extemporaneous speaking are doubtless many.