What are the antonyms for OBLIGATORY?

Synonyms for OBLIGATORY

Usage Examples for OBLIGATORY

  1. The requirements for entrance are strict and examinations for the higher positions are obligatory. - "Wage Earning and Education" by R. R. Lutz
  2. Judge Hollenback declares that his letter of instruction from Mr. Thorpe makes it obligatory for him to read the document in the presence of his widow and his grandson, and in the library of his late home. - "From the Housetops" by George Barr McCutcheon