Related Clues:

• Sinus ending
• Informal encouragement
• "Seriously!"
• 'It's the truth'
• ''Really!''
• "Really!"
• Beyond reproach
• 'Let's go already!'
• "Oh, really?"
• ''And that's ___'' (''Believe you me'')
• “Let’s go!”
• ''I'm not kidding!''
• Reply to 'that a fact?' (4)
• "I kid you not"
• Without guile