Word:
dubious

Context Sentence:
The principle of equivalent effect which has enjoyed great popularity in certain cultrues at certain times, involves us in areas of speculation and at times can lead to very dubious conclusions.

Source:
Bassnett, S. (2002) Translation Studies PP33

Definition:
adj.
dubious about sth/doing sth : not certain and slightly suspicious about sth; doubtful; uncertain in result

e.g. I remain dubious about her motives.
The results of this policy will remain dubious for some time.