| 1 | Late Latin | phantasticus | imaginary |
| 2 | Ancient Greek | φανταστικός | — |
| 3 | Ancient Greek | -τικός | relating to, suited to, skilled in, able to,... |
| 4 | Ancient Greek | -σις | Added to verb stems to form abstract nouns or... |
| 5 | Ancient Greek | -τις | Earlier form of -σις , retained after dentals δ,... |
| 6 | Proto-Indo-European | -tis | Derives abstract/action nouns from verb roots |