Synonyms For "Simple" :

1 syllable:

bare, mere, plain

2 syllables:

childlike, easy, naif, naive, simplex

3 syllables:

retarded, simpleton, simplistic

4 syllables:

elementary, unsubdivided

5 syllables:

uncomplicated, unproblematic

6 syllables:

unanalyzable, undecomposable, unsophisticated