1. An ironic thank you
   - thanks a lot 
2. An emphasized thank you
   - many thanks, thanks a lot

Encyclopedia: Thanks a million

• import
• import barrier
• import credit
• import duty
• importable
• importance
• important
• important person
• important-looking
• importantly
• importation
• imported
• importee
• importer
• importing
• importunate
• importunately
• importune
• importunity
• imposable
• impose
• imposed
• imposer
• imposing
• imposingly