What does "promptness" mean?

The habit or characteristic of doing things without delay.

What is a synonym for "promptness"?

Common synonyms include: punctuality, timeliness, abruptness, acceptance, accord, acquiescence.

/ˈpɹɒmptnəs/ noun

noun ·Moderate ·High school level

Noun

1
The habit or characteristic of doing things without delay. uncountable, usually
2
the quality or habit of adhering to an appointed time wordnet
3
The habit of adhering to a designated time. uncountable, usually
4
the characteristic of doing things without delay wordnet

"He replied with promptness and courtesy."

From prompt + -ness.