enlightening

CIDE DICTIONARY

enlightening, adj. 

•  enlightening so as to encourage intellectual or moral improvement.  [WordNet 1.5]
•  tending to increase knowledge or dissipate ignorance; as, an enlightening glimpse of government in action.  [WordNet 1.5]

THESAURUS

enlightening

advisory, allegorizing, annotative, autodidactic, brightening, broadening, clarifying, coeducational, communicative, critical, cultural, demonstrative, demythologizing, didactic, disabusing, disciplinary, disenchanting, disillusionary, disillusioning, disillusive, edifying, editorial, educating, educational, educative, elucidative, euhemeristic, exegetic, exemplificative, exhortatory, explaining, explanatory, explicative, explicatory, expositive, expository, glossarial, homiletic, hortatory, illuminant, illuminating, illuminative, illumining, illustrative, informational, informative, informing, initiatory, instructive, introductory, lecturing, lightening, lighting, monitory, preaching, preceptive, propaedeutic, rationalistic, rationalizing, scholiastic, self-teaching, teaching, tuitionary, undeceiving