Rebarbative, which means causing annoyance or repulsion, has several antonyms that carry positive connotations. One is attractive, which means having qualities that draw people towards it. Another is pleasant, which suggests something that is enjoyable, pleasing or agreeable. Another antonym is appealing, which connotes something that is attractive, interesting or engrossing. Inviting is another antonym that describes something that is welcoming, hospitable or tempting. Finally, alluring is another antonym that suggests something that is tempting, captivating or enchanting. Each of these words carries a positive connotation that stands in stark contrast to the negative tone of rebarbative.