Related Clues:

• All keyed up
• Having the jitters, perhaps
• Tightly wound
• Tied up in knots
• It can be past or present, in grammar
• Verb form
• Anxiously impatient
• Grammar concern
• Like some performance art
• Far from laid-back
• About to snap
• Pushing the envelope
• Like a bundle of nerves
• Innovative and daring
• Out there, in pop culture