fantastically

The story

1. Proto-Indo-European*bʰeh₂-
2. Proto-Indo-European*bʰh₂nyéti
3. Proto-Hellenic*pʰáňňō
4. Ancient Greekφαίνω (phaínō)
5. Ancient Greekφαντάζω (phantázō)
6. Ancient Greekφανταστικός (phantastikós)
7. Late Latinphantasticus
8. Middle Frenchfantastique
9. Englishfantastic
10. Proto-Indo-European*h₂el-
11. Proto-Indo-European*h₂élisder.?
12. Proto-Indo-European*leyg-
13. Proto-Germanic*līką
14. English todayfantastically

From fantastic + -ally.