Pronunciation: (är'dnt),[key] —adj. 1. having, expressive of, or characterized by intense feeling; passionate; fervent: an ardent vow; ardent love. 2. intensely devoted, eager, or enthusiastic; zealous: an ardent theatergoer. an ardent student of French history. 3. vehement; fierce: They were frightened by his ardent, burning eyes. 4. burning, fiery, or hot: the ardent core of a star.