Ominous, fateful (10)

I believe the answer is:

portentous

This clue is a double definition.

'ominous' is the first definition.
(I've seen this before)

'fateful' is the second definition.
(I know that fateful can be written as portentous)

(Other definitions for portentous that I've seen before include "Of great significance" , "Of ominous meaning" .)

I've seen this clue in The Mirror.

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