PROPITIOUS.

Synonyms:

auspicious,benignant,favorable,gracious,kindly,
benign,clement,friendly,kind,merciful.

That which is auspicious is of favorable omen; that which is propitious is of favoring influence or tendency; as, an auspicious[292] morning; a propitious breeze. Propitious applies to persons, implying kind disposition and favorable inclinations, especially toward the suppliant; auspicious is not used of persons.

Antonyms:

adverse,forbidding,ill-disposed,repellent,unfriendly,
antagonistic,hostile,inauspicious,unfavorable,unpropitious.

Preposition:

May heaven be propitious to the enterprise.