Less and less
Definition 1 of 1
Pro Tip 1/3Frequency Usage
Use 'less and less' to express a gradual decrease in frequency of an action or event. 
She found herself checking her phone less and less.
Pro Tip 2/3Emphasizing Change
Emphasize a continuous decrease over time; suggests an ongoing process. 
The old well was used less and less.
Pro Tip 3/3Expectation Adjustment
Signal to lower expectations for the likelihood or quality of something happening. 
Winning the lottery seemed less and less possible.