fantasticfantastic

Fantastic comes from Middle French fantastique, from Late Latin phantasticus, from Greek φανταστικός ‘imaginary’, from φαντάζω ‘to make visible’, ultimately from φαίνω ‘to show’.

1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰh₂-n-yé-ti¹reconstructed
2. Proto-Hellenicc. 2200–1600 BCE*pʰáňňō¹reconstructed
3. Ancient Greekc. 800–300 BCEφαίνω¹‘to cause to appear, show’
4. Ancient Greekc. 800–300 BCEφαντός¹‘visible’
5. Ancient Greekc. 800–300 BCEφαντάζω¹‘to show, make visible’
6. Ancient Greekc. 800–300 BCEφανταστικός¹‘able to produce the appearance of something’
7. Late Latinc. 200–600 CEphantasticus¹
8. Middle Frenchc. 1400–1600fantastique¹
9. Englishearliest quotation 1661fantastic¹

1. ¹ Wiktionary, English fantastic
2. Earliest quotation in Wiktionary’s entry: 1661, Robert Boyle, THE CONCLUSION: “And indeed, when in the writings of Paracelſus I…”.