IPA: /əˈbrʌpt.nəs/
KK: /əˈbrʌptnəs/
The quality of being sudden or unexpected, often in a way that is harsh or ungracious. It can also refer to a steep or rugged surface.
The abruptness of his departure left everyone in shock.
Abruptness is formed from "abruptus" (from Latin, meaning broken off or steep) and the suffix "-ness" (meaning the state or quality of). The word describes the quality of being sudden or steep, as if something has been broken off abruptly.
Think of something that is 'broken off' ('abruptus') suddenly, which helps you remember that 'abruptness' refers to the quality of being sudden or steep.