Related Clues:

• It may be past or present
• Nerve-racking
• On the verge of snapping
• Grammar class subject
• Feeling tense
• Antsy
• Ready to snap
• Showing strain
• Strung out
• Present, for example
• Language study topic
• Full of misgivings
• Perfect, e.g.
• Stretched tight
• Past or future, e.g.