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Synonyms for Simple (same or very similar meaning)

WordNet sense 1 (a person lacking intelligence or common sense):

WordNet sense 2 (exhibiting childlike simplicity and credulity):
childlike, wide-eyed, dewy-eyed, round-eyed

WordNet sense 3 (marked by or showing unaffected simplicity and lack of guile or worldly experience):
naif, naive

WordNet sense 4 (lacking complexity):
uncomplicated, unsophisticated

WordNet sense 5 (of a leaf shape; rounded at the apex):

WordNet sense 6 ((botany) of leaf shapes; of leaves having no divisions or subdivisions):

WordNet sense 7 (lacking mental capacity and devoid of subtlety):
half-witted, dim-witted, simple-minded

WordNet sense 8 (apart from anything else; without additions or modifications):
bare, mere

WordNet sense 9 (not elaborate or elaborated; simple):

WordNet sense 10 (easy and not involved or complicated):
elementary, unproblematic

WordNet sense 11 (posing no difficulty; requiring little effort):

From the ODE community, based on WordNetadd/edit