Related Clues:

• Cutting edge
• The ultimate motivator
• 'An instructor of great sagacity': Emerson
• '___ not!'
• Trepidation
• Affright
• An emotion
• Adrenaline releaser
• Wedding day jitters
• "Cape ___"
• Feeling of dread
• Cause of goosebumps
• Emotion induced by horror films
• Lack of courage
• Cause of cold sweat