The simple one — from a root meaning 'open': the wide-open, gullible, un-made-up mind, easily persuaded either way (plural petayim, 1:4, 22). Not stupid — UNFORMED; Proverbs' prime student, and prime target for the sinner's enticement (the same root as patah, 'to entice,' 1:10). KJV 'the simple.' → first discussed at Gen 1:4