1. never changing; always staying the same

1. something that does not change
Usage: formal

Examples

• The speed of light is an invariable constant in physics.
• Her daily routine was invariable – coffee at 7 AM, work at 8 AM.
• The company’s invariable policy is to respond to complaints within 24 hours.
• Mathematical constants are invariable values that never change.
• His invariable good humor made him popular with everyone.
• The invariable in this equation helps us solve the problem.