problematic

Posing a problem; difficult to solve.

Open to doubt; debatable.

Not settled; unresolved or dubious.

Something that poses a problem or difficulty.

Of the nature of a problem; questionable; uncertain; unsettled; disputable; doubtful.

In logic, of the nature of a question, possible or doubtful.

Having the nature of a problem; not shown in fact; questionable; uncertain; unsettled; doubtful.

posing a problem; difficult to overcome or solve

debatable; open to doubt

unresolved or dubious