Synonyms for Uncongenial (same or very similar meaning)
WordNet sense 1 (very unfavorable to life or growth):
hostile, unfriendlyWordNet sense 2 (unfavorable to life or growth):
inhospitableWordNet sense 3 (not agreeing with your tastes or expectations):
disagreeableWordNet sense 4 (not compatible):
incompatibleFrom the ODE community, based on WordNetadd/edit