biased · adjective /ˈbɑɪ.əst/
biased
C1 showing unfair support for or opposition to someone or something because of your personal opinions
Dictionary example:
The newspapers gave a biased report of the meeting.
Learner example:
Maybe it is not an original idea, but I must admit my choice was a little bit biased, since I am reading a book about this era at the moment. (Certificate in Advanced English; C1; Portuguese)