Related Clues:

• Not blather
• Dispense sound advice
• "You expect me to believe that?"
• 'Be reasonable!'
• 'Let's be reasonable ...'
• Sound sound
• "You're kidding, right?"
• Give sound advice
• 'You must be joking ...'
• 'Enough of this gibberish!'
• "You can't be serious"
• Speak logically, though seen to be upset after discussions
• Express wisdom
• 'You've gotta be joking ...'
• 'Don't be absurd!'