As an adjective optional
is not compulsory; left to personal choice; elective.
As a verb encouraged is
Not compulsory; left to personal choice; elective.
- On that beach clothing is entirely optional .
To mentally support; to motivate, give courage, hope or spirit.
To spur on, strongly recommend.
- I encouraged him during his race.
To foster, give help or patronage
- We encourage the use of bicycles in the town centre.
- ''The royal family has always encouraged the arts in word and deed