decaf

This term is a clipped form of decaffeinated and is used primarily in casual, everyday speech, particularly in cafes and restaurants. While it functions as an adjective to describe the type of beverage, it is frequently used as a noun in a shorthand manner to refer to the drink itself.

In a professional or scientific context, the full term decaffeinated is preferred. The word carries a neutral connotation, though it is often contrasted with regular or caffeinated to specify dietary preferences or health restrictions.