Simplicity

наивност

naivnost

(artlessness of mind; freedom from cunning or duplicity; lack of acuteness and sagacity)

простодушие

prostodušie

(weakness of intellect; silliness; folly)

простота́

prostotá

(quality or state of being simple, unmixed, or uncompounded; as, the simplicity of metals or of earths)

простота́

prostotá

(quality or state of being not complex, or of consisting of few parts)

простота́

prostotá

(freedom from artificial ornament, pretentious style, or luxury)