"Unadulterated joy" means experiencing pure or genuine happiness without any mixture of sadness, worry, or any other negative emotions. Full definition
I remember seeing her come through the crowd, skipping back, two streams of tickets in her hands, her hair glowing in the sunlight, a look of pure unadulterated joy on her face, drunk with power and independence. (crappypictures.com)
Let's all give a collective sigh of appreciation for the pure unadulterated joy of books. (theexpeditioner.com)
I am happy we pulled off a last gasp win against Bolton and I was jumping up and down with sheer unadulterated joy as everyone else around me at Anfield but Roy Hodgson should really have taken the chance to show some humility following what was a very lucky escape for the club and indeed his position as manager of the club. (caughtoffside.com)