Webster's English Dictionary

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dubious

Cross references:
  1. doubtful              
 
du.bi.ous \'d(y)u:-be--*s\ aj [L dubius, fr. dubare to vacillate; akin to L 
   duo two - mor]e at TWO 1: occasioning doubt : EQUIVOCAL  2: unsettled in 
   opinion  3: of doubtful promise or uncertain outcome  4: questionable as to 
   value, quality, or origin  - du.bi.ous.ly av