As nouns the difference between tiredness and tardiness
is that tiredness is the state of being tired while tardiness is the state or quality of being tardy.
tiredness
English
Noun
(-)
The state of being tired.
Synonyms
*
Anagrams
*
tardiness
English
Noun
(uncountable) The state or quality of being tardy.
(countable) The result or product of being tardy.
Synonyms
* lateness
Antonyms
* punctuality