Final answer:
Using 'in conclusion' in a speech is not inherently inappropriate, but skilled public speakers may choose to use other transition phrases or gestures to signal the conclusion.
Step-by-step explanation:
Using the phrase 'in conclusion' in a speech is not necessarily inappropriate. It is commonly used to signal the end of a presentation or to summarize the main points. However, skilled public speakers may choose to avoid using this phrase as it can sound cliché or may disrupt the flow of their speech. Instead, they can use other transition phrases like 'to sum up,' 'in summary,' 'lastly,' or simply signal the conclusion through their body language and tone.
Learn more about Appropriateness of using 'in conclusion' in a public speech