Antonyms of noun punctuality

1 sense of punctuality

Sense 1
punctuality, promptness -- (the quality or habit of adhering to an appointed time)
       Antonym of tardiness (Sense 1)
      => tardiness -- (the quality or habit of not adhering to a correct or usual or expected time)

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

1 sense of punctuality

Sense 1
punctuality, promptness -- (the quality or habit of adhering to an appointed time)
       => timing -- (the time when something happens)