Related Clues:

• Stiffen
• Not cool at all
• English class topic
• Emotionally charged
• Walking on eggshells
• Like a tie game in overtime
• Suspenseful
• Not easy
• Future perfect, for one
• Pluperfect, e.g.
• Noun concerning verbs
• Needing a massage
• Needing kneading?
• Far from relaxed
• Lacking slack