sterile, unimaginative, uninspired, uninventive -- (deficient in originality or creativity; lacking powers of invention; "a sterile ideology lacking in originality"; "unimaginative development of a musical theme"; "uninspired writing")
unimaginative -- (dealing only with concrete facts)
stereotyped, stereotypic, stereotypical, unimaginative -- (lacking spontaneity or originality or individuality; "stereotyped phrases of condolence"; "even his profanity was unimaginative")