Antonyms for the word "most captivating" would include words like unappealing, uninspiring, uninteresting, boring, and dull. These words describe experiences or things that are not interesting or engaging to a person. They may not have any qualities that capture a person's attention or imagination, leaving them feeling unimpressed or disinterested. While "most captivating" suggests that something is engaging and draws people in, its antonyms suggest the complete opposite. People often seek out things that are captivating, so it's important to understand what qualities make something the opposite of that, in order to avoid boredom or disappointment.