noun

• The state or quality of being simple
• The quality or state of being unmixed or uncompounded
• The quality or state of being not complex, or of consisting of few parts.
• Lack of sharpness of mind; lack of ability to think using complex ideas; stupidity
• Lack of artificial ornament, pretentious style, or luxury; plainness
• Lack of subtlety or abstruseness; clarity
• Lack of complication; efficiency.
• (archaic, rare) An act or instance of foolishness.