Related Clues:

• "Honest"
• Hardly a trifling matter
• "Cross my heart!"
• 'For real!'
• 'You've got to be kidding!'
• ''I kid you not!''
• "It's the truth!"
• ''It's true!''
• ''Truly!''
• "I'm serious!"
• ''That's a fact!''
• 'That's true!'
• 'This is on the level'
• "I don't believe that"
• 'Honest to goodness!'