Synonyms for simple

modified

1. Not complicated

   single, unmixed, unblended, mere, uncompounded, unalloyed, unadulterated, not complex, uncomplicated, without confusion, simplistic, not confusing, pure.

2. Plain

   unadorned, unaffected, homely; see modest 2.

3. Easy

   easy, not difficult, mild, of little difficulty, not arduous, done with ease, with great facility, manageable, presenting no difficulty, not puzzling; see also easy 2.

   Antonyms obscure*, puzzling, difficult*.

4. Stupid

   inane, dull, ignorant; see shallow 2, stupid 1.

5. Unsophisticated

   ingenuous, plain, artless; see innocent 1, naive. See syn. study at easy.