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Synonyms for Unfit (same or very similar meaning)

WordNet sense 1 (physically unsound or diseased):
bad, unsound

WordNet sense 2 (not in or exhibiting good health in body or mind):

WordNet sense 3 (not meant or adapted for a particular purpose):

WordNet sense 4 (make unfit or unsuitable):
disqualify, indispose

From the ODE community, based on WordNetadd/edit