The Collaborative International Dictionary of English v.0.48:

Scholarly \Schol"ar*ly\, a.
   Like a scholar, or learned person; showing the qualities of a
   scholar; as, a scholarly essay or critique. -- adv. In a
   scholarly manner.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "scholarly":
   abstruse, academic, bookish, brainy, civilized, cross-disciplinary,
   cultivated, cultured, deep, devoted to studies, diligent,
   disciplinary, donnish, dryasdust, educated, egghead, encyclopedic,
   erudite, graduate, graduate-professional, highbrowed, intellectual,
   interdisciplinary, learned, lettered, literate, longhair, mandarin,
   owlish, pansophic, pedagogical, pedantic, polyhistoric, polymath,
   polymathic, postgraduate, professional, professorial, profound,
   rabbinic, scholastic, schoolish, scientific, studious, taught,
   technical, technicological, technological, trained, wise