From WordNet (r) 3.0 (2006):
simple
adj 1: having few parts; not complex or complicated or involved;
"a simple problem"; "simple mechanisms"; "a simple
design"; "a simple substance" [ant: complex]
2: easy and not involved or complicated; "an elementary problem
in statistics"; "elementary, my dear Watson"; "a simple
game"; "found an uncomplicated solution to the problem" [syn:
elementary, simple, uncomplicated, unproblematic]
3: apart from anything else; without additions or modifications;
"only the bare facts"; "shocked by the mere idea"; "the
simple passage of time was enough"; "the simple truth" [syn:
bare(a), mere(a), simple(a)]
4: exhibiting childlike simplicity and credulity; "childlike
trust"; "dewy-eyed innocence"; "listened in round-eyed
wonder" [syn: childlike, wide-eyed, round-eyed, dewy-
eyed, simple]
5: lacking mental capacity and subtlety [syn: dim-witted,
simple, simple-minded]
6: (botany) of leaf shapes; of leaves having no divisions or
subdivisions [syn: simple, unsubdivided] [ant:
compound]
7: unornamented; "a simple country schoolhouse"; "her black
dress--simple to austerity"
n 1: any herbaceous plant having medicinal properties
2: a person lacking intelligence or common sense [syn:
simpleton, simple]