Source : WordNet®

unenlightening
     adj 1: not tending to inform or clarify; "an unenlightening
            comment" [syn: {uninformative}, {uninstructive}] [ant:
             {enlightening}]
     2: not edifying [syn: {unedifying}] [ant: {edifying}]
     3: failing to enlighten or clarify; "an unilluminating report"
        [syn: {unilluminating}] [ant: {illuminating}]