ques·tion·able 
/ˈkwɛstʃənəbəl/ adjective
/ˈkwɛstʃənəbəl/ adjective 1 : not likely to be true or correct : giving reason to doubt or question something
▪ The truth of the statements was highly questionable. ▪ a questionable conclusion ▪ It is questionable whether this is the right decision. [=I question/doubt whether this is the right decision] 2 : likely to be bad : not worthy of trust
▪ The water available in the village is of questionable quality. ▪ a man of questionable character ▪ They acquired the money through questionable means. 3 : not certain : unknown or undecided
▪ The company is facing a questionable future.
▪ The truth of the statements was highly questionable. ▪ a questionable conclusion ▪ It is questionable whether this is the right decision. [=I question/doubt whether this is the right decision]
▪ The water available in the village is of questionable quality. ▪ a man of questionable character ▪ They acquired the money through questionable means.
▪ The company is facing a questionable future.
— ques·tion·ably /ˈkwɛstʃənəbli/ adverb
▪ questionably obtained money
/ˈkwɛstʃənəbli/ adverb ▪ questionably obtained money
