1
: having a quality of ominous prophecy
a fateful remark
2
a
: involving momentous consequences : decisive
… made his fateful decision to declare war …—
W. L. Shirer
b
3
: controlled by fate : foreordained
fatefulness
noun
fate·ful·ness
-fəlnə̇s
plural -es
: the quality or state of being fateful
unaware of the fatefulness of their meeting until it resulted in both their deaths
Love words? Need even more definitions?
Merriam-Webster unabridged



