When it is in electric mode it is very quiet.
2016 Hyundai Sonata Hybrid Base Hybrid
I love how quiet it is. It is a smooth ride. Gas mileage is excellent. I have had issues with the water pump for the hybrid system malfunctioning and having to be replaced. The first time it took 3 weeks to get the part. The second time my car completely shut off in the middle of a very busy intersection. The dealership said they fixed it but I went 2 miles and had the same issue. The third time it took a week to get it fixed. Same part each time.