The definition of "bemused" isn't "amused." If someone is bemused, they are confused; lost in thought; bewildered; baffled. If you want to say that someone is amused, there is a word for that: "amused."
In this blog, we will highlight instances of professional or semi-professional writers misusing this slippery word in its various parts of speech.
Inspired by, but completely unaffiliated with, d-e-f-i-n-i-t-e-l-y.com .