General synonyms:
* Obstruct
* Impediment
* Hamper
* Impede
* Restrict
* Curtail
* Thwart
* Delay
* Slow down
* Prevent
More specific synonyms:
* Stymie: To block or prevent progress.
* Frustrate: To make someone feel annoyed or discouraged.
* Disrupt: To interrupt or cause disorder.
* Inhibit: To hold back or restrain.
* Interfere: To get in the way of something.
* Check: To stop or slow down something.
* Compromise: To weaken or damage something.
The best synonym for "hinder" will depend on the specific situation. For example, if you are talking about a physical obstacle, "obstruct" or "impediment" might be the best choices. If you are talking about something that is preventing someone from achieving their goals, "frustrate" or "thwart" might be more appropriate.