illegitimate

ˌɪlɪˈdʒɪtɪmət

adjective

not authorized by the law; not in accordance with accepted standards or rules.

defending workers against illegitimate managerial practices

illegal,unlawful,illicit,against the law,criminal,lawbreaking,actionable,felonious,unlicensed,unauthorized,unsanctioned,unwarranted,unofficial,banned,forbidden,barred,prohibited,outlawed,interdicted,proscribed,not allowed,not permitted,against the rules,contraband,black-market,under the counter,bootleg,fraudulent,corrupt,dishonest,dishonourable,verboten,malfeasant,crooked,shady,bent,dodgy

noun

a person who is illegitimate by birth.