Synonyms for Addictive:

adj.

all (adjective)
habit-forming.

n.

classy, adaptive, badass, babyish, constitutionally, born, flawed, flexible, Clingy. nice, enjoyable, attractive, restful, lovely, relaxing, pleasant, pleasurable, pleasing, cheerful. addictive (noun)
habit-forming.

Other synonyms:

classy, babyish, adaptive, flexible, flawed. badass, Clingy, born, constitutionally. Other relevant words:
classy, babyish, born, flawed, badass, constitutionally, Clingy.