IPA: /ˌprɒbləˈmætɪkəl/
KK: /prɑːbləˈmætɪkəl/
Something that is uncertain or causes doubt; it can be unclear or questionable.
The solution to the problem was considered problematical by many experts.
Problematical → It is formed from "problem" (from Latin *problema*, meaning a question or issue) and the suffix "-ical" (meaning pertaining to or relating to). The word "problematical" refers to something that is related to or characterized by problems or difficulties.
Think of a 'problem' that is 'pertaining to' or 'related to' issues — that's what problematical means.