untoward vs inauspicious

untoward and inauspicious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
untoward	No	Yes	No	No
inauspicious	No	Yes	No	No

As adjectives, untoward and inauspicious are synonyms defined as:

Other synonyms of untoward include adverse.

untoward (adjective)	inauspicious (adjective)
not in keeping with accepted standards of what is right or proper in polite society	not auspicious; boding ill
contrary to your interests or welfare	contrary to your interests or welfare
	presaging ill fortune