multiple keywords of the same type

By dark121, in UFS Rules Q & A

say i play dragon lifter, which has stun:2 on it. then gave it an effect that gave it stun:1 as well

the attack now has stun:2, stun:1. right?

say i use the stun:2 and my opponent responds with the devil within.

i'd lose 2 vitality and my stun:2 would be cancelled. but would i still have the stun:1 and it's not effected in any way right?

Yup, that's how it works.