simple
adjective
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easy and not involved or complicatedelementary
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unornamented“a simple country schoolhouse”
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lacking mental capacity and subtletydim-witted
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(botany) of leaf shapesunsubdivided
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having few parts
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exhibiting childlike simplicity and credulityround-eyedwide-eyedchildlikedewy-eyed
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apart from anything elsebare
noun
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a person lacking intelligence or common sensesimpleton
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any herbaceous plant having medicinal properties