dubitable

Adjective

• open to doubt or suspicion
  • the candidate's doubtful past
    
  • he has a dubious record indeed
    
  • what one found uncertain the other found dubious or downright false
    
  • it was more than dubitable whether the friend was as influential as she thought- Karen Horney
    

Related words

• Synonyms: 
  doubtful , dubious , in question(p)