As nouns the difference between timeliness and promptitude
is that timeliness is the state of being timely while promptitude is the quality of being prompt; alacrity.
timeliness
English
Noun
(-)
the state of being timely
Synonyms
* promptness
* punctuality
promptitude
English
Noun
(-)
The quality of being prompt; alacrity.
Synonyms
* (quality of being prompt) promptness