Antonyms of noun legitimacy

1 of 2 senses of legitimacy

Sense 1
legitimacy -- (lawfulness by virtue of being authorized or in accordance with law)
       Antonym of illegitimacy (Sense 2)
      => illegitimacy -- (unlawfulness by virtue of not being authorized by or in accordance with law)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun legitimacy

2 senses of legitimacy

Sense 1
legitimacy -- (lawfulness by virtue of being authorized or in accordance with law)
       => lawfulness -- (the quality of conforming to law)

Sense 2
authenticity, genuineness, legitimacy -- (undisputed credibility)
       => credibility, credibleness, believability -- (the quality of being believable or trustworthy)