Related Clues:

• 'This is on the level'
• 'Honest to goodness!'
• Unbribable
• ''That's the truth!''
• 'No fooling!'
• 'That's the truth!'
• "Seriously!"
• 'It's the truth'
• ''Really!''
• "Really!"
• Beyond reproach
• ''And that's ___'' (''Believe you me'')
• ''I'm not kidding!''
• "I kid you not"
• Without guile