Adjective: problematical ,pró-blu'ma-ti-kul
- Open to doubt or debate
"The project's success was problematical";
- debatable, problematic
- Making great mental demands; hard to comprehend, solve or believe
"The problematical theorem stumped even experienced mathematicians";
- baffling, elusive, knotty, problematic, tough
See also: difficult, hard, questionable