The Collaborative International Dictionary of English v.0.48:

Warm-hearted \Warm"-heart`ed\, a.
   Having strong affection; cordial; sincere; hearty;
   sympathetic. -- Warm"-heart`ed*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

warmhearted
    adj 1: marked by warmth of feeling like kindness and sympathy
           and generosity; "gave a warmhearted welcome to the
           stranger" [ant: coldhearted]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "warmhearted":
   Christian, Christlike, Christly, affectionate, amiable, ardent,
   benign, benignant, bleeding, brotherly, charitable, clement,
   commiserative, compassionate, condolent, cordial, decent, delicate,
   emotionable, forbearant, fraternal, friendly, generous, genial,
   gentle, good, gracious, hearty, hospitable, human, humane,
   impressionable, kind, kindhearted, kindly, kindly-disposed,
   lenient, liberal, loving, melting, merciful, neighborly, nice,
   open, openhearted, passible, pitying, receptive, responsive,
   ruthful, sensible, sensitive, soft, softhearted, susceptible,
   sympathetic, sympathizing, tender, tenderhearted, understanding,
   warm, welcoming