1
be questionable
His motives are questionable.
他的动机值得怀疑。
可疑的；有问题的；不确定的
先理解核心含义，再看它在真实句子里的用法。
可疑的；有问题的；不确定的
open to doubt or challenge; uncertain or possibly not true
His motives are questionable.
他的动机值得怀疑。
成问题的；可疑的。
Problematic; open to doubt or challenge.
可质疑的
subject to question
品行或道德上可疑的。
Of dubious respectability or morality.
可以反驳的
able to be refuted
The company's accounting practices are questionable, raising concerns among investors.
该公司的会计做法可疑，引起了投资者的担忧。
AI contextual example
It is questionable whether the new policy will actually improve the situation.
新政策是否真能改善情况，这很可疑。
AI contextual example
His motives for offering help seemed questionable to me.
他提供帮助的动机在我看来很可疑。
AI contextual example
questionable motives
可疑的动机。
WordNet
His motives are questionable.
他的动机值得怀疑。
The company engaged in questionable business practices.
该公司从事了有问题的商业行为。
I find it questionable that no one noticed the error.
我觉得没有人注意到这个错误是值得怀疑的。
Not this
I am questionable about his decision.
Use this
I am doubtful about his decision.
questionable 是形容词，描述事物本身可疑，不能用来描述人感到怀疑；表达人的怀疑应用 doubtful 或 questioning。
Not this
His honesty is questionable.
Use this
His honesty is unquestionable.
questionable 意为“可疑的”，而这里要表达“毫无疑问的”，应用 unquestionable。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
可疑行为
His questionable behavior at the party made everyone uncomfortable.
他在聚会上的可疑行为让所有人感到不舒服。
品味低劣
The decor showed questionable taste with clashing colors.
装饰品颜色冲突，显得品味低劣。
有问题的道德标准
The politician's questionable ethics were exposed by the media.
这位政客有问题的道德标准被媒体曝光了。
判断力差
Investing in that company showed questionable judgment.
投资那家公司显示了判断力差。
动机可疑
She had questionable motives for offering to help.
她主动提供帮助的动机可疑。
有效性存疑
The study's findings are of questionable validity due to small sample size.
由于样本量小，该研究结果的有效性存疑。
Use questionable naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 questionable 拆成 question（问题）和 able（能），能提出问题的就是可疑的。
语域：mixed 常见场景：学术讨论、法律语境、日常对话 questionable 在多种场合均可使用，包括正式与非正式语境，通常用于表达对某事真实性或合理性的怀疑。多用于学术、法律等需要谨慎判断的领域，但在日常对话中也很常见。
Words ending in '-able' (comfortable, reasonable, inevitable, suitable) share the suffix but have different stress patterns and do not rhyme with 'questionable'. 'Question' shares the initial 'question-' but ends differently. 'Unquestionable' is a direct derivative.
Dictionary facts from ECDICT, WIKTIONARY.