simple

adjective

1
easy and not involved or complicated
an elementary problem in statistics
elementary, my dear Watson
2
apart from anything else; without additions or modifications
only the bare facts
shocked by the mere idea
3
unornamented
a simple country schoolhouse
her black dress--simple to austerity
4
lacking mental capacity and subtlety
5
(botany) of leaf shapes; of leaves having no divisions or subdivisions
6
having few parts; not complex or complicated or involved
a simple problem
simple mechanisms
7
exhibiting childlike simplicity and credulity
childlike trust
dewy-eyed innocence

Also useful for “simple”:Unscrambler— Rearrange the letters in “simple”