Dic: favorable, propitious, auspicious, benign, conducive

Synonyms: favorable, propitious, auspicious, benign, conducive

These adjectives describe what is indicative of a successful outcome.

(1) Favorable can refer to what contributes in a positive way to the attainment of a goal: a favorable review.
(2) Propitious implies a favorable tendency or inclination: "Miracles are propitious accidents" George Santayana.
(3) Auspicious refers to what presages good fortune: an auspicious beginning.
(4) Benign applies to people or things that exert a beneficial influence: "I lingered round them, under that benign sky . . . and wondered how anyone could ever imagine unquiet slumbers, for the sleepers in that quiet earth" Emily Brontë.
(5) Something conducive leads or contributes to a result, often a desirable one: a quiet place conducive to reading.