The Oxford Thesaurus An A-Z Dictionary of Synonyms - simpleadj.

1) uncomplicated, plain, uninvolved, unsophisticated, understandable, intelligible, (easily) understood, comprehensible, clear, lucid, straightforward, easy, elementary, basic: At the age of four, Jan was able to do simple mathematical calculations. 2) plain, unadorned, undecorated, unembellished, basic, fundamental, elementary, elemental, mere, unostentatious, unassuming, unpretentious, modest, classic, uncluttered, stark, clean, severe, austere, Spartan, homely; unvarnished, naked, honest: Thea was stunning in a simple black dress with a colourful scarf and gold jewellery. The simple truth is that he came home from work to find the house broken into and his wife gone. 3) sincere, frank, candid, open, unaffected, uncomplicated, unpretentious, straightforward, above-board, simple-hearted, uncontrived, direct, upright, square, forthright, four-square, righteous, honest, na‹ve, guileless, artless, undesigning, childlike, ingenuous, unsophisticated, innocent, green: The colonel was a simple man who was respected because he always said just what he meant. A simple heart may be its own best guide. 4) unsophisticated, na‹ve, slow, slow-witted, stupid, thick, thickheaded, simple-minded, feeble-minded, oafish, bovine, dense, obtuse, dull, dull-witted, witless, halfwitted, brainless, backward, imbecilic or chiefly Brit imbecile, cretinous, Colloq dumb, moronic: That chap Dawson is far too simple to understand what you are asking him. 5) lowly, humble, inferior, mean, base, subservient, common, subordinate: The lord of the manor regarded his tenants as simple folk, a breed apart from himself and his family.