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Optional

adjective

/ˈɒp.ʃən.əl/

Meaning

not compulsory; left to choice

Not required; left to personal choice.

Wearing a tie is optional for this event.

The dress code for the party is optional.

voluntary, elective, discretionary, noncompulsory

Entry 1

voluntary, elective, discretionary

Entry 2

voluntary, elective, discretionary, noncompulsory

mandatory, compulsory, required

Entry 1

mandatory, compulsory, required

Entry 2

mandatory, compulsory, required

optional subject, optional feature, optional extra, optional course

Entry 1

optional subject, optional feature, optional extra

Entry 2

optional course, optional subject, optional feature

difficult to read or understand; ill-tempered

expensive; elaborate; extravagant; generous

not achieving desired aims or results; failing to accomplish a purpose

Quick to detect or respond to slight changes, signals, or influences; easily affected emotionally or...

Of the cerebrum of the brain.

dependable; trustworthy; consistent;