problematic

Adjective

• making great mental demands; hard to comprehend or solve or believe
  • a baffling problem
    
  • I faced the knotty problem of what to have for breakfast
    
  • a problematic situation at home
    

• open to doubt or debate
  • If you ever get married, which seems to be extremely problematic
    

Related words

• Synonyms: 
  baffling , elusive , knotty , problematical , tough , debatable