tautological

/ˌtɔːtəˈlɑːdʒɪkəl/
adjective
  1. Saying the same thing twice in different words, often unnecessarily; redundant.
    • Saying 'past history' is tautological because history is always about the past.
    • A tautological statement like 'it is what it is' adds no new meaning.
    • The politician's speech was tautological, repeating the same promises over and over.
Antonyms
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