adj. 25B6; adjective COMPULSORY, obligatory, mandatory, involuntary, forced, imposed, required, requisite, stipulated, prescribed, contractual, binding, necessary, unavoidable, inescapable.
voluntary.
ENFORCED
Meaning of ENFORCED in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012