A problem or difficulty in a particular field of study.
Difficult to overcome, solve, or decide.
Contributing (especially if subtly) to discrimination (such as racism, sexism, homophobia, transphobia, or ageism).
Not settled, uncertain, of uncertain outcome; debatable, questionable, open to doubt.
a problematic analysis
Suitable or fit to be relied on; worthy of dependence, reliance or trust; dependable, trustworthy
Such that either a sent packet will reach its destination, even if it requires retransmission, or the sender will be told that it didn't
Something or someone reliable or dependable