Source : Webster's Revised Unabridged Dictionary (1913)

Passionate \Pas"sion*ate\, a. [LL. passionatus: cf. F.
   passionn['e].]
   1. Capable or susceptible of passion, or of different
      passions; easily moved, excited or agitated; specifically,
      easily moved to anger; irascible; quick-tempered; as, a
      passionate nature.

            Homer's Achilles is haughty and passionate. --Prior.

   2. Characterized by passion; expressing passion; ardent in
      feeling or desire; vehement; warm; as, a passionate
      friendship. ``The passionate Pilgrim.'' --Shak.

   3. Suffering; sorrowful. [Obs.] --Shak.

Passionate \Pas"sion*ate\, v. i.
   1. To affect with passion; to impassion. [Obs.]

            Great pleasure, mixed with pitiful regard, The godly
            kind and queen did passionate.        --Spenser.

   2. To express feelingly or sorrowfully. [Obs.] --Shak.

Source : WordNet®

passionate
     adj : having or expressing strong emotions [ant: {passionless}]