Here's what rhymes with insightful.

Consider these alternatives

informative / formative incisive / decisive enlightening / frightening erudite / might amusing / using opinionated / dated astute / food wry / eye hilarious / various sardonic / chronic empathetic / magnetic humorous / humerus forthright / right introspective / objective entertaining / training revelatory / story instructive / destructive articulate / late glib / it offbeat / feet funny / money