Related Clues:

• ''Really!''
• "Really!"
• Beyond reproach
• ''And that's ___'' (''Believe you me'')
• ''I'm not kidding!''
• "I kid you not"
• Without guile
• ''No fooling!''
• "No fooling!"
• "I swear!"
• 'Honestly!'
• Like some opinions
• 'I'm not lying!'
• 'Really and truly'
• "I'll swear on a stack of Bibles!"