General terms:
* Clear: This is a simple and straightforward way to say that the speaker is easy to understand.
* Articulate: This suggests that the speaker is skilled at forming words and sounds clearly.
* Precise: This emphasizes the accuracy and distinctness of the speaker's pronunciation.
More specific terms:
* Diction: This refers to the clarity and pronunciation of words, which are important for good speech.
* Enunciation: This is the specific act of pronouncing words clearly and distinctly.
* Voice projection: This refers to the speaker's ability to use their voice effectively to reach the audience, which often includes clear articulation.
You can also use descriptive phrases to highlight the speaker's skill:
* "They spoke with impressive clarity."
* "Their enunciation was impeccable."
* "Their words were perfectly formed and easy to understand."
Ultimately, the best term depends on the specific context and the nuances you want to convey.