problematic
UK: /ˌprɒbləˈmætɪk/ | US: /ˌprɑːbləˈmætɪk/
adj. presenting a problem or difficulty; open to doubt or dispute
adj. (Logic) involving or constituting a problematic proposition
The word "problematic" derives from the Greek problēma (πρόβλημα), meaning "something thrown forward" (i.e., a question or obstacle), via Latin problema. The suffix "-atic" (from Greek -atikos through Latin -aticus) forms adjectives, implying "pertaining to." Thus, "problematic" literally means "relating to a problem." Over time, it evolved to describe situations or propositions that are uncertain, disputed, or inherently challenging.
The lack of data makes the research findings problematic.
His behavior became increasingly problematic for the team.
The ethical implications of the experiment are highly problematic.
The plan sounds good in theory but may prove problematic in practice.
Some historical interpretations remain problematic due to biased sources.