The most common and most likely answer to this crossword clue is the 8 letter word IDIOCIES
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Buddy explains!
The straight part
We know that "Absurdities" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case absurdities = idiocies.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does IDIOCIES mean?
IDIOCIES noun- The state or condition of being an idiot; the quality of having an intelligence level far below average; mental retardation.
- An act lacking intelligence or sense; an instance of senselessness; extremely foolish behaviour.