What are the antonyms for MANDATORY?

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Synonyms for MANDATORY

Usage Examples for MANDATORY

  1. Hence, if the state may make mandatory training in intelligence, it may also command training to secure physical soundness and capacity. - "Health Work in the Public Schools" by Leonard P. Ayres and May Ayres
  2. To all these communications the Council replied either by issuing orders which were always mandatory, or by sending letters which often contained information and advice as well as instructions. - "British Committees, Commissions, and Councils of Trade and Plantations, 1622-1675" by Charles M. Andrews