1.any herbaceous plant having medicinal properties
2.a person lacking intelligence or common sense
3.having few parts; not complex or complicated or involved;
a simple problem
4.easy and not involved or complicated;
an elementary problem in statistics
5.apart from anything else; without additions or modifications;
only the bare facts
6.exhibiting childlike simplicity and credulity;
childlike trust
7.lacking mental capacity and devoid of subtlety
8.(botany) of leaf shapes; of leaves having no divisions or subdivisions
9.not elaborate in style; unornamented;
a simple country schoolhouse