bar•ren adj ˈber-ən, ˈba-rən
1: not reproducing: as a : incapable of producing offspring —used especially of females or matings b : not yet or not recently pregnant: habitually failing to fruit
2: not productive: as a : producing little or no vegetation : DESOLATE b : producing inferior crops c : unproductive of results or gain : FRUITLESS
Adjectives are used to describe nouns, giving them attributes. Barren is an adjective that means whatever noun it is referring to can't reproduce or is fruitless.
