The story
- Proto-Indo-European*bʰeh₂-
- Proto-Indo-European*bʰh₂nyéti
- Proto-Hellenic*pʰáňňō
- Ancient Greekφαίνω (phaínō)
- Ancient Greekφαντάζω (phantázō)
- Ancient Greekφανταστικός (phantastikós)
- Late Latinphantasticus
- Middle Frenchfantastique
- Englishfantastic
- Proto-Indo-European*bʰeh₂-
- Proto-Indo-European*bʰéh₂ti
- Proto-Italic*fāōr
- Latinfor, fā-
- Latinfābula
- Proto-Indo-European*h₃ed-
- Proto-Indo-European*h₃édosder.?
- Latinfābulōsus
- Middle Englishfabulous
- Englishfabulous
- Englishfantabulous
- English todayfantabulously
From fantabulous + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.