The term 'no longer pure' can be described by three crossword solutions: CONTAMINATED (12 letters), TAINTED (7 letters), and ADULTERATED (11 letters). CONTAMINATED means to have been made impure by contact with something unclean or poisonous, while TAINTED implies that something has been spoiled or corrupted. ADULTERATED is a more specific term, meaning that something has been mixed with an inferior or cheaper substance. All three terms refer to a state of being no longer pure, as the original substance has been altered in some way.