DUBITABLE
doubtful, dubious, dubitable, in question
(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
Source: WordNet® 3.1
Etymology
Adjective
dubitable (comparative more dubitable, superlative most dubitable)
Capable of being doubted; susceptible of being questioned.
Synonyms
• doubtable
• doubtful
• uncertain
Antonyms
• indubitable
Source: Wiktionary
Du"bi*ta*ble, a. Etym: [L. dubitabilis. Cf. Doubtable.]
Definition: Liable to be doubted; uncertain. [R.] Dr. H. More.
– Du"bi*ta*bly, adv. [R.]
Source: Webster’s Unabridged Dictionary 1913 Edition