suppositional (adj.)

• alleged
• arguable
• assumed
• assumptive
• confutable
• conjectural
• contestable
• controversial
• controvertible
• debatable
• deemed
• deniable
• disputable
• doubtable
• doubtful
• dubious
• dubitable
• given
• granted
• hypothetical
• iffy
• mistakable
• moot
• postulational
• presumptive
• problematic
• putative
• questionable
• refutable
• speculative
• supposed
• supposititious
• suspect
• suspicious
• understood