Is there any way possible to make the iPhone 6 plus' vibration softer?

The iPhone 6 plus has a hard/loud vibration is there any app or a setting I could change to possibly lessen or make softer the vibration without changing the vibration pattern?

Yes. You go into your settings and choose sound. Then click on your vibration setting and choose the create your own vibration option and then tap the screen gently and quickly one time and push stop name your pattern and choose that as your preference. It may not be softer but it won't last as long so it won't be so much noise

Nope. Can't change the intensity but can change the pattern.