Purity — being unmixed or genuine; can describe sincere feelings (pure) or something chemically unadulterated (pure substance).
彼の喜びは純粋だった。
His joy was pure.
この水は純粋で飲めますか。
Is this water pure and drinkable?
純粋な好奇心からその質問をしただけだ。
I asked that question out of pure curiosity.