simple (Adjective) — Having few parts; not complex, complicated or involved. ex. "a simple problem" ex. "simple mechanisms" ex. "a simple design" ex. "a simple substance"
simple (Adjective) — Easy and not involved or complicated. ex. "a simple game"
simple (Adjective) — Apart from anything else; without additions or modifications. ex. "the simple passage of time was enough"
simple (Adjective) — Exhibiting childlike simplicity and credulity. ex. "simple trust"
simple (Adjective) — Lacking mental capacity and subtlety. ex. "I was simple enough to fall for one man's lies"
simple (Adjective) — (botany) of leaf shapes; of leaves having no divisions or subdivisions.
simple (Adjective) — Unornamented. ex. "a simple country schoolhouse" ex. "her black dress--simple to austerity"
simple (Noun) — A person lacking intelligence or common sense.
simple (Noun) — Any herbaceous plant having medicinal properties.