Related Clues:

• "Honest"
• Incorruptible
• "No lie!"
• Hardly a trifling matter
• "Cross my heart!"
• 'For real!'
• 'No lie'
• ''I kid you not!''
• "It's the truth!"
• ''It's true!''
• ''Truly!''
• "I'm serious!"
• ''That's a fact!''
• "No, really!"
• Insistent affirmation