Related Clues:

• Therefore
• See 21-Across
• Thus
• 'As if I care'
• Unconcerned retort
• 'And I should give a darn, why?'
• "Big deal"
• 'And I should care, why?'
• ''Who cares''
• 'Big deal!'
• 'Who cares?'
• ''Who cares?''
• 'Am I supposed to be impressed?'
• 'I'm not impressed'
• See 20 Across