The Collaborative International Dictionary of English v.0.48:

Impassioned \Im*pas"sioned\, p. p. & a.
   Actuated or characterized by passion or zeal; showing warmth
   of feeling; ardent; animated; excited; as, an impassioned
   orator or discourse.
   [1913 Webster]

WordNet (r) 3.0 (2006):

impassioned
    adj 1: characterized by intense emotion; "ardent love"; "an
           ardent lover"; "a fervent desire to change society"; "a
           fervent admirer"; "fiery oratory"; "an impassioned
           appeal"; "a torrid love affair" [syn: ardent,
           fervent, fervid, fiery, impassioned, perfervid,
           torrid]