I'm with
Findegil and
Galin here about strength of will being Boromir's forte against the Nazgûl.
Concerning his death, the draft versions of
The Heirs of Elendil in HoME XII read:
Quote:
A: Death hastened by wounds got in the war.
B: His life was shortened by wounds received from the poisoned weapons of Morgul.
C: His life was shortened by the poisoned wounds he received in the Morgul-war.
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So I'm inclined to read the 'Morgûl wound' of the final text in Appendix A as abbreviation/condensation of the wordings in B and C above.
Besides, if he'd been wounded with a Morgûl knife like the one the WK used against Frodo on Weathertop, wouldn't he have been turned into a wraith rather than killed or letally poisoned?