It's on the tip of my tongue, but doesn't want to bubble to the surface. I thought you people might be able to help me recall this word. It would apply in the following examples to fill in the blanks:
After believing for years that the strange structure was created by alien lifeforms, finding out the simple, Earthly explanation left Beth feeling [blank].
The boy left the show [blank] after sneaking to the side of the stage and seeing the secrets of the magician's tricks.
Disenchanted and demystified, which aren't the correct terms, are popping into my head. Perhaps they suggest that the correct word is similar.