The small mistake went beneath notice during the presentation.
beneath reproach
Frequency:
50
%
Her work ethic was beneath reproach.
beneath contempt
Frequency:
40
%
The behavior of the politician was beneath contempt.
Idiomatic Expressions for beneath contempt
Phrase: sink beneath contempt
Meaning: to become even more despicable or unworthy of respect
Usage: After lying under oath, the politician sank beneath contempt in the eyes of the public.