| 1 | Latin | frūstror | — |
| 2 | Latin | frustra | in deception, in error; without effect, to no... |
| 3 | Latin | fraus | A cheating, deceit, guile, fraud; A delusion,... |
| 4 | Proto-Indo-European | dʰrewgʰ- | to deceive, to mislead; to serve one's tribe;... |
| 5 | Proto-Indo-European | dʰer- | to support; to hold |