- 1. 懷疑的，疑惑的[F][（+about/of）][+wh-]
I'm doubtful whether she's still alive. 我懷疑她是否還健在。
- 2. 可疑的，令人生疑的
a doubtful remedy 療效可疑的療法
- 3. 含糊的，不明確的；難以預測的
The future looks very doubtful. 前途看來難以預測。
- 4. （名聲等）不好的
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