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Synonyms for Unfavorable (same or very similar meaning)

WordNet sense 1 (not favorable):

WordNet sense 2 (marked by features that oppose constructive treatment or development):

WordNet sense 3 (contrary to your interests or welfare):
adverse, inauspicious

WordNet sense 4 (in an opposing direction):
contrary, contrary

From the ODE community, based on WordNetadd/edit