simple
noun
any herbaceous plant having medicinal properties
a person lacking intelligence or common sense
Synonymssimpleton
adjective
having few parts; not complex or complicated or involved
“a simple problem”
“simple mechanisms”
Oppositescomplexeasy and not involved or complicated
“an elementary problem in statistics”
“elementary, my dear Watson”
apart from anything else; without additions or modifications
“only the bare facts”
“shocked by the mere idea”
exhibiting childlike simplicity and credulity
“childlike trust”
“dewy-eyed innocence”
lacking mental capacity and subtlety
(botany) of leaf shapes; of leaves having no divisions or subdivisions
SynonymsunsubdividedOppositescompoundunornamented
“a simple country schoolhouse”
“her black dress--simple to austerity”
Source: WordNet 3.1, Princeton University
