Tendentious

 
I came across the word tendentious in a book the other day. I thought it meant argumentative but that didn't quite fit the context so I looked it up.

Tendentious means trying to influence opinion; written or spoken with personal bias in order to promote a cause or support a viewpoint.

Some synonyms include provocative, opinionated, biased, partisan, subjective, argumentative, prejudiced, one-sided, questionable, doubtful, and partial.