1. In a manner that cannot be evaded
   - compulsorily, obligatorily

See also: mandatory

• 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