The definition of naive is being immature, unaware or overly trusting.
Not fit for an adult; immature; silly
Easy to understand, do, or carry out:
Find another word for simplistic. In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for simplistic, like: naive, plausible, condensed, childish, oversimplified, overly simplified, simple, facile, one-sided, nonsensical and formulaic.