The word "reels off" means to recite something quickly or easily. The antonyms for this phrase could include stumble, hesitate, struggle, fumble, or falter. If someone isn't able to easily recite information, they may stumble over words or hesitate to remember them correctly. This could be due to a lack of confidence or knowledge on the subject matter. On the other hand, if someone is comfortable with a topic, they may effortlessly reel off information without any difficulty. In order to improve at reciting information, it may be helpful to practice and gain a stronger understanding of the subject matter.