Antonyms of noun attractiveness

1 of 2 senses of attractiveness

Sense 2
attractiveness -- (sexual allure)
       Antonym of unattractiveness (Sense 1)
      => unattractiveness -- (an ugliness of appearance that is not appealing to viewers)

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

2 senses of attractiveness

Sense 1
attraction, attractiveness -- (the quality of arousing interest; being attractive or something that attracts; "her personality held a strange attraction for him")
       => quality -- (an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare)

Sense 2
attractiveness -- (sexual allure)
       => beauty -- (the qualities that give pleasure to the senses)