1. Diminish
2. Wane
3. Disappear
4. Evanesce
5. Vanish
6. Dwindle
7. Subside
8. Dissolve
9. Fizzle
10. Recede
11. Decay
12. Ebb
13. Blur
14. Weaken
15. Wither
16. Wane
17. Abate
18. Desiccate
19. Extinguish
20. Dim
21. Fritter
22. Dilute
23. Flicker
24. Discolor
25. Fade away
26. Fluctuate
27. Perish
28. Discern
29. Deflate
30. Fag out

When you are looking for different ways to express the idea of something fading away, there are many synonyms that you can use. Some of the best ideas are to use words such as diminish, wane, disappear, evanesce, vanish, dwindle, subside, dissolve, fizzle, recede, decay, ebb, blur, weaken, wither, abate, desiccate, extinguish, dim, fritter, dilute, flicker, discolor, fade away, fluctuate, perish, discern, deflate, and fag out. All of these words have slightly different meanings and nuances, so it is important to select the one that best fits the context of your writing.