Reel off is a phrasal verb that means to recite or deliver something quickly and easily. The antonyms for the word reel off are hesitate, stumble, stammer, falter, and pause. These words indicate a lack of confidence or difficulty in delivering a speech, presentation, or recitation. When a person hesitates, stumbles or stammers, they struggle to find the right words, and their speech may become disjointed or incoherent. In contrast, when a person can reel off something, it shows that they are confident and comfortable with the topic they are discussing. Therefore, having a broad vocabulary and mastery of language can help prevent stumbling or hesitation while delivering a speech or presentation.