Antonyms for the word "most spellbinding" could be dull, uninteresting, unexciting, unimpressive, or bland. These words would describe anything that fails to captivate or hold someone's attention. Something that is not spellbinding may be forgettable or lackluster. It may fail to engross or enchant an audience, causing them to lose interest quickly. Antonyms for "most spellbinding" may vary depending on the context or the type of experience being described. However, they all share the common theme of not being able to hold attention or ignite excitement in the viewer, reader, or listener.