symphenomenal

The story

1. Proto-Indo-European*ḱe?
2. Proto-Indo-European*ḱómder.?
3. Proto-Indo-European*sem-der.?
4. Proto-Hellenic*ksún
5. Ancient Greekσύν (sún)
6. Ancient Greekσῠν- (sŭn-)
7. Ancient Greekσῠμ- (sŭm-)
8. Englishsym-
9. Proto-Indo-European*bʰeh₂-
10. Proto-Indo-European*bʰh₂nyéti
11. Proto-Hellenic*pʰáňňō
12. Ancient Greekφαίνω (phaínō)
13. Ancient Greekφαινόμενον (phainómenon)
14. Late Latinphaenomenon
15. Englishphenomenon
16. Proto-Indo-European*h₂el-
17. Proto-Indo-European*h₂élisder.?
18. Ancient Greekφαινόμενον (phainómenon)
19. Frenchphénomène
20. Frenchphénoména
21. Englishphenomenal
22. English todaysymphenomenal

From sym- + phenomenal.