Impure
noun, な adjective
ふじゅん
純粋 (じゅんすい) Pure, Genuine
不純 (ふじゅん) Impure
汚い (きたない) Dirty, Filthy, Foul, Unclean
不潔 (ふけつ) Filthy, Dirty
不浄 (ふじょう) Uncleanliness, Dirtiness, Impurity, Filthiness, Defilement
Yuri says 不純 means Impure of heart/motive.
Fooling ふ around in June じゅん is Impure.