1. Much less
   - let alone, not to mention

1. It does not matter
   - no matter

Encyclopedia: Never mind

• circular
• circular file
• circular function
• circular measure
• circular plane
• circular saw
• circular-knit
• circularisation
• circularise
• circularity
• circularization
• circularize
• circularly
• circulate
• circulating
• circulating decimal
• circulating library
• circulation
• circulative
• circulator
• circulatory
• circulatory failure
• circulatory system
• circum-
• circumambient