Adjective : propitious weather. ,propitious omens. ,propitious gods.    From Dictionary.com. 

Sheridan the unpropitiousness of the season, particularly for a first experiment in authorship, and advised the postponement of the publication till October.    From Wordnik.com.  [Memoirs of the Life of the Rt. Hon. Richard Brinsley Sheridan — Volume 01] Reference

Such reflections, far from engendering in our minds and hearts the slightest trace of perplexity, of discouragement or doubt, should reinforce the basis of our convictions, demonstrate to us the incorruptibility, the strange workings and the invincibility of a Faith which, despite the assaults which malignant and redoubtable enemies from the ranks of kings, princes and ecclesiastics have repeatedly launched against it, and the violent internal tests that have shaken it for more than a century, and the relative obscurity of its champions, and the unpropitiousness of the times and the perversity of the generations contemporaneous with its rise and growth, has gone from strength to strength, has preserved its unity and integrity, has diffused its light over five continents, reared the institutions of its Administrative Order and spread its ramifications to the four corners of the earth, and launched its systematic campaigns in both the Western and Eastern.    From Wordnik.com.  [Messages to America] Reference