The Collaborative International Dictionary of English v.0.48:

Saintly \Saint"ly\, a. [Compar. Saintlier; superl.
   Saintliest.]
   Like a saint; becoming a holy person.
   [1913 Webster]

         So dear to Heaven is saintly chastity.   --Milton.
   [1913 Webster] Saint Nicholas

WordNet (r) 3.0 (2006):

saintly
    adj 1: marked by utter benignity; resembling or befitting an
           angel or saint; "angelic beneficence"; "a beatific
           smile"; "a saintly concern for his fellow men"; "my
           sainted mother" [syn: angelic, angelical, beatific,
           saintlike, saintly, sainted]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "saintly":
   Christlike, Christly, Elysian, God-fearing, angelic, archangelic,
   beatific, beatified, blameless, blessed, blissful, canonized,
   celestial, cherubic, consecrated, dedicated, devoted, devout,
   divine, empyreal, empyrean, glorified, godlike, godly,
   godly-minded, good, hallowed, heavenly, holy, holy-minded, honest,
   in glory, just, martyred, moral, otherworldly, paradisiac,
   paradisial, paradisian, paradisic, pious, pure, pure in heart,
   purehearted, redeemed, right-minded, righteous, sainted, saintlike,
   sanctified, saved, seraph, seraphic, set apart, spiritual,
   spiritual-minded, straight, sublime, unearthly, unworldly, upright,
   upstanding, virtuous, worthy