Adjectives

(a)sterile, unfertile, infertileincapable of reproducing“an infertile couple”
(s)aseptic, sterilefree of or using methods to keep free of pathological microorganisms“a sterile operating area”, “aseptic surgical instruments”, “aseptic surgical techniques”
(s)sterile, unimaginative, uninspired, uninventivedeficient in originality or creativity; lacking powers of invention“a sterile ideology lacking in originality”, “unimaginative development of a musical theme”, “uninspired writing”