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Synonyms for Sane (same or very similar meaning)

WordNet sense 1 (having a clear mind):
lucid

WordNet sense 2 (of sound mind, memory, and understanding; in law, competent to got to trial):
compos mentis

WordNet sense 3 (marked by sound judgment):
reasonable

WordNet sense 4 (consistent with or based on or using reason):
rational


From the ODE community, based on WordNetadd/edit