Paleolithic Etymology of :
FRuSTRer
Linguistic references
https://en.wiktionary.org/wiki/frustrer
Semantic fields in Paraklist
Saracens, Pharisians and Adversaries
in S2
[Sources]
STRuGGLe
eNeMy
RiVaL
STRiFe
ThReaT
ThWaRT
HoSTis
eSTRiF
eNNeMi
RiVaL
MeNaCe
FRuSTRer
STReit