Revivalist preachers are best described as

enthusiastic speakers

Explanation:

Revivalist preachers were the key elements of the Second Great Awakening that brought a series of religious revivals at the beginning of the nineteenth century. Revivalist preachers used to travel on horseback, meeting people from urban cities, rural areas, and frontier territories to spread the word on a spiritual and moral renewal through extremely enthusiastic and emotional speeches.

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