Related Clues:

• Trendsetting
• Grammarian's concern
• Stiffen
• Groundbreaking
• Not cool at all
• English class topic
• Testy
• Emotionally charged
• Walking on eggshells
• Unable to sit still
• Like a tie game in overtime
• Suspenseful
• Not easy
• Future perfect, for one
• Pluperfect, e.g.