Doubtful Definition
 doutfəl 
    adjective
  
 
    doubtfuller
  
In doubt; not clear or definite; ambiguous.
 Webster's New World 
Experiencing or showing doubt.
 Doubtful that the cord would hold, we strengthened it.
 American Heritage 
Feeling doubt; unsettled in opinion or belief.
 Webster's New World 
Not clearly predictable; uncertain; unsure.
 Webster's New World 
Giving rise to doubt or suspicion; questionable, as in reputation.
 Webster's New World 
Synonyms: 
  Other Word Forms of Doubtful
Adjective
Base Form:
 doubtful
          Comparative:
        
 doubtfullerOrigin of Doubtful
-  From doubt + -ful. From Wiktionary 
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