nonobligatory
Speech parts
1. nonobligatory - Adjective
2. nonobligatory - Adjective Satellite
Meaning
not required by rule or law
Source: WordNetSynonyms
nonmandatory
free
auxiliary
alternative
extra
arbitrary
optional
voluntary
elective
incidental
ancillary
frivolous
discretionary
immaterial
inconsequential
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Antonyms
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Examples
Friendship is a strange animal. It only thrives in voluntary enjoyment of each other's company, in the pleasure of nonobligatory connection. I repeat: You owe me nothing.