Quick definitions from WordNet (simple)

▸ noun:  any herbaceous plant having medicinal properties
▸ noun:  a person lacking intelligence or common sense
▸ adjective:  not elaborate in style; unornamented ("A simple country schoolhouse")
▸ adjective:  (botany) of leaf shapes; of leaves having no divisions or subdivisions
▸ adjective:  having few parts; not complex or complicated or involved ("A simple problem")
▸ adjective:  easy and not involved or complicated ("A simple game")
▸ adjective:  lacking mental capacity and devoid of subtlety
▸ adjective:  exhibiting childlike simplicity and credulity ("Simple courtesy")
▸ name:  A surname (very rare: popularity rank in the U.S.: #78122)

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▸ Also see simple