Voluntary(adjective)
Done, given, or acting of one's own free will.
Hindi meaning:स्वैच्छिक/स्वेच्छा से
Synonyms: Free, Autonomous, Discretional, Willful
Antonyms: Forced, Involuntary, Obligatory, Unwilling
Example: We need a couple of people to help us clean up the gymnasium after the party. Are there any volunteers?
Forms: Volunteer, Volunteered, Volunteered
Trick to remember: Swachh Bharat Abhiyan me Volunteer bna hu Voluntary se. 
