If you are looking for a word that embodies the lack of devotion or commitment, then you might find "uncommitted" appropriate. However, if you want to emphasize the irresponsibility and insincerity that come with undedicated work, then "indifferent" might be more fitting. Another option is "half-hearted," which implies that the effort put forth was minimal or lacking in enthusiasm. Additionally, "half-baked" or "uninspired" could both be used to imply an absence of originality or creativity in one's work. In any case, whether you use "uncommitted," "indifferent," or any of these other synonyms, they all describe a lack of effort or dedication that undermines successful achievement.