What is the term for bourbon that has not been blended and has no additives?

The correct term for bourbon that has not been blended and has no additives is "straight bourbon whiskey." This classification indicates that the bourbon has been aged in new charred oak barrels for a minimum of two years and does not contain any artificial ingredients, flavorings, or colors. The term "straight" ensures that the whiskey is a specific representation of its category, providing assurance of quality and adherence to strict production standards.

"Pure bourbon whiskey" does not exist as a recognized term in the same regulatory sense as "straight bourbon whiskey" does, and it may not carry the same legal implications. "Condensed bourbon whiskey" is not a term used in the industry, and it doesn’t denote a specific type of bourbon. "Single barrel bourbon" refers to bourbon that comes from a single aging barrel, which can have variations in flavor depending on the characteristics of that particular barrel, but it could potentially contain additives or be blended with other barrels for consistency, so it doesn't align with the definition provided in the question.