The word "dubious" means something uncertain or doubtful. It generally refers to things that seem suspicious or not entirely trustworthy. Full definition
When their school decides to host a reality - TV show of dubious distinction, four students band together to save the school and its students from commercial exploitation. (booklistonline.com)
For those of you practicing outside your area of expertise, I believe the rules allow submitting your own clients for this admittedly dubious distinction. (blawgit.com)
And for most artists without such an intellectual background, in those days they were very dubious about making abstractions just for fear that they really didn't mean anything. (aaa.si.edu)