problematic
Concise Oxford English Dictionary © 2008 Oxford University Press:
problematic/prɒbləˈmatɪk/
▶adjective constituting or presenting a problem. ▶noun a problematic thing.
– derivatives
problematical adjective,
problematically adverb.
problematical adjective,
problematically adverb.
– origin C17: via Fr. from late L. problematicus, from Gk problēmatikos, from problēma (see problem).
'problematic' also found in these Oxford entries:

