1. (of circumstances) tending to constrict freedom
   - constricting, narrowing 
2. Restricting the scope or freedom of action
   - confining, constraining, limiting, restricting

See also: narrow, restrictive

• sulfide
• sulfisoxazole
• sulfonamide
• sulfonate
• sulfone
• sulfonic acid
• sulfonylurea
• sulfur
• sulfur bacteria
• sulfur bottom
• sulfur butterfly
• sulfur dioxide
• sulfur hexafluoride
• sulfur mine
• sulfur mustard
• sulfur oxide
• sulfur paintbrush
• sulfur-yellow
• sulfurette
• sulfuretted
• sulfuric
• sulfuric acid
• sulfurised
• sulfurized
• sulfurous