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What are the antonyms for UNNECESSARY?

Synonyms for UNNECESSARY

Usage Examples for UNNECESSARY

  1. But immediately it became unnecessary, and she only laughed and said,- " It hasn't been a long time at all." - "Rose MacLeod" by Alice Brown
  2. They object sometimes, because they think it is unnecessary. - "The Ascent of the Matterhorn" by Edward Whymper
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