doubtful

• 对某事感到不确定或没有把握；也用于形容某事不太可能发生或可疑。

Feeling uncertain about something or not convinced; also used to describe something unlikely to happen or be true.

1. Uncertain or not sureB1formal

   Feeling uncertain about something or not convinced.

   怀疑的

   • I am doubtful about the success of this plan.
   • She was doubtful whether he would arrive on time.
   • The outcome of the negotiations remains doubtful.

   同义词distrustfuldubiousquestioningsuspiciousuncertainunsure

   反义词certainconfidentconvincedpositivesure

2. Unlikely or improbableB1formal

   Not likely to happen or be true.

   不大可能

   • It is doubtful that they will finish the project by Friday.
   • His chances of winning the lottery are doubtful.
   • The weather forecast is doubtful for the weekend.

   同义词dubiousimprobablequestionableuncertainunlikely

   反义词certainindubitablelikelyprobablesureunquestionable

3. Questionable or suspiciousB2formal

   Not trustworthy or reliable; causing suspicion.

   可疑的

   • The company's financial records are doubtful.
   • His motives for helping were doubtful.
   • The evidence presented in court was highly doubtful.

   同义词dubiousfishyquestionableshadysuspectsuspiciousunreliableuntrustworthy

   反义词certaincredibleindubitablereliablesuretrustworthyunquestionable