A secret goal or an ulterior motive. I didn't trust Julie when she started being really nice to me out of the blue. It felt like she had a hidden agenda.I'm starting to wonder if the boss has a hidden agenda because he promised me the job but now he won't return my calls.
Fig. a secret plan; a concealed plan; a plan disguised as a plan with another purpose. I am sure that the chairman has a hidden agenda. I never did trust him anyway.