Problematic
Part of speech: adjective
Definition: posing a problem; difficult to overcome or solve debatable; open to doubt unresolved or dubious doubtful or uncertain in its outcome
Part of speech: noun
Definition: A problem or difficulty in a particular field of study
Example sentence: The connections between and among women are the most feared, the most problematic, and the most potentially transforming force on the planet.
Questionable
Part of speech: adjective
Definition: Problematic; open to doubt or challengeOf dubious respectability or morality
Example sentence: The planet will survive. Whether we get to be here and enjoy it, or enjoy life as we've known it, is what's questionable.