adj ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Not compulsory. not-comparable

Synonyms

All synonyms

facultativenonobligatenonobligatorynonrequisiteoptional

Antonyms

All antonyms

mandatoryobligaterequisite

Etymology

From non- + compulsory.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.