Synonyms of nonobligatory
- 1 Syllable
- free
- 2 Syllables
- open, extra
- 3 Syllables
- optional, unforced
- 4 Syllables
- arbitrary, elective, volitional, discretional, unrestricted, voluntary
- 5 Syllables
- nonmandatory, noncompulsory, facultative, alternative, discretionary