IPA: /æbˈsɜrdnəs/
KK: /æbˈsɜrdnəs/
The quality or state of being ridiculous or unreasonable, often in a way that is laughable or nonsensical.
The absurdness of the situation made everyone laugh.
Absurdness is formed from "absurdus" (from Latin, meaning out of tune or incongruous) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being absurd or ridiculous.
Think of something that is 'out of tune' or doesn't make sense ('absurdus') — that's why 'absurdness' refers to the quality of being absurd.