Dangerously insecure or unstable; perilous.
Relating to incipient caries.
Depending on the intention of another.
Not settled, uncertain, of uncertain outcome; debatable, questionable, open to doubt.
Difficult to overcome, solve, or decide.
Contributing (especially if subtly) to discrimination (such as racism, sexism, homophobia, transphobia, or ageism).
a problematic analysis
A problem or difficulty in a particular field of study.