Obstructionist carries a negative impression, suggesting stubborn and unreasonable opposition. Don't be an obstructionist; we need to find a compromise.
Pro Tip 2/3
Deliberate Delay
An obstructionist intentionally causes delay, it's not just about being slow. The senator was labelled an obstructionist for filibustering the bill.
Pro Tip 3/3
Behaviour in Groups
Often used to describe someone opposing the majority in meetings or organizations. His obstructionist stance in the committee prevented any progress.