Unfairly disliked as a result of prejudice, slander, or hasty assumptions.
Not comprehended correctly.
Contributing (especially if subtly) to discrimination (such as racism, sexism, homophobia, transphobia, or ageism).
Difficult to overcome, solve, or decide.
Not settled, uncertain, of uncertain outcome; debatable, questionable, open to doubt.
a problematic analysis
A problem or difficulty in a particular field of study.