The Collaborative International Dictionary of English v.0.48:

Gladden \Glad"den\, v. t. [imp. & p. p. Gladdened; p. pr. &
   vb. n. Gladdening.] [See Glad, v. t.]
   To make glad; to cheer; to please; to gratify; to rejoice; to
   exhilarate.
   [1913 Webster]

         A secret pleasure gladdened all that saw him.
                                                  --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gladdened
    adj 1: made joyful; "the sun and the wind on his back made him
           feel exhilarated--happy to be alive" [syn: gladdened,
           exhilarated]