Antonyms of noun tardiness

1 sense of tardiness

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

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

1 sense of tardiness

Sense 1
tardiness -- (the quality or habit of not adhering to a correct or usual or expected time)
       => timing -- (the time when something happens)