Here's what rhymes with informative.

Consider these alternatives

enlightening / frightening entertaining / training instructive / destructive amusing / using enjoyable / employable concise / price humorous / humerus opinionated / dated informational / educational lively / precisely edifying / dying truthful / useful revelatory / story erudite / might explanatory / story intriguing / speaking approachable / notable riveting / visiting hilarious / various laudatory / story presentations / relations