Synonym: doubtful, dubious, implausible, improbable, uncertain, unlikely. Similar words: unquestionable, unquestionably, question, in question, question mark, questionnaire, unconscionable, out of the question. Meaning: ['kwestʃnəbl] 
adj. 1. subject to question 2. able to be refuted.
adj. 1. subject to question 2. able to be refuted. 
Random good picture Not show
1, He behaved in a questionable manner towards her.
2, The statistics are highly questionable .
3, Your argument is based on a set of questionable assumptions.
4, It is questionable whether this goal can be achieved.
5, Her motives for helping are questionable.
6, Their motives for undertaking this study are highly questionable.
7, The conclusions that they come to are highly questionable.
8, Such a questionable assertion is sure to provoke criticism.
9, He was a man of questionable character.
10, This action is ethically questionable.
11, It's questionable whether anything of substance has been achieved.
12, Much of late-night television is of questionable value/taste.
13, He has been dogged by allegations of questionable business practices.
14, It is questionable whether this is a good way of solving the problem.
15, It is questionable whether the taxpayer receives value for money.
16, The cogency of this prescriptive analysis is highly questionable.
17, Such a view seems highly questionable.
18, The legality of testing employees for drugs is questionable.
19, Tumin regards this as a very questionable assumption.
20, The picture's value is questionable.
21, The value of such a simple dichotomy is questionable.
22, However,(http://sentencedict.com/questionable.html) this is a rather questionable assumption.
23, For some questionable assumptions are being made.
24, This argument is questionable for two reasons.
25, How benign these films are, though, is questionable.
26, Barton has been involved in some questionable financial deals.
27, Many couples have been frightened by questionable results.
28, Some of the arguments in favour of shutting the factory are questionable and others downright spurious.
29, I suspected that his motives for helping us were questionable.
30, His best friend was killed by police under extremely questionable circumstances.
More similar words: unquestionable, unquestionably, question, in question, question mark, questionnaire, unconscionable, out of the question, beyond question, rhetorical question, personable, reasonable, unreasonable, constitutional convention, inestimable, sequestration, congestion, suggestion, institutional, destination, restitution, indigestion, constitutional, gesticulation, investigation, unconstitutional, predestination, constitutionalism, prestidigitation, additional investment.