1. In an overbearingly domineering manner; as a dictator
   - dictatorially, autocratically, bossily 
2. In an authoritative and magisterial manner
   - authoritatively

See also: magisterial

• slippery slope
• slipping
• slippy
• slipshod
• slipskin grape
• slipstick
• slipstream
• slipway
• slit
• slit lamp
• slit trench
• slither
• slithering
• slithery
• sliver
• slivery
• slivovitz
• Slo-Bid
• Sloane Ranger
• Sloanea
• Sloanea jamaicensis
• slob
• slobber
• slobber over
• slobberer