portentous vs fateful

portentous and fateful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
portentous	No	Yes	No	No
fateful	No	Yes	No	No

As adjectives, portentous and fateful are synonyms defined as:

Other synonyms of portentous include foreboding.

portentous (adjective)	fateful (adjective)
puffed up with vanity	having momentous consequences; of decisive importance
ominously prophetic	controlled or decreed by fate; predetermined
of momentous or ominous significance	ominously prophetic
	(of events) having extremely unfortunate or dire consequences; bringing ruin