1. Struck or filled with terror
   - terror-struck

See also: afraid, 'fraid [non-standard]

• side-to-side
• side-wheeler
• side-whiskers
• sidearm
• sideband
• sidebar
• sideboard
• sideburn
• sidecar
• sidehill
• sidekick
• sidelight
• sideline
• sidelong
• sideman
• sidepiece
• sidereal
• sidereal day
• sidereal hour
• sidereal month
• sidereal time
• sidereal year
• siderite
• Sideritis
• sideroblast