Formal:
* The research team invariably found that the new medication had positive results.
* The company's CEO invariably delivers inspiring speeches at the annual conference.
* The students invariably perform well on tests after studying diligently.
Informal:
* My cat invariably wakes me up at 5 AM for breakfast.
* The weather in this town invariably seems to be either sunny or rainy.
* My grandmother invariably forgets where she put her glasses.
With a negative connotation:
* The government's policies invariably result in negative consequences for the poor.
* The company's CEO invariably makes decisions that benefit himself rather than the employees.
Note: "Invariably" means "always" or "without exception." It emphasizes that something happens consistently, regardless of circumstances.