conspicuous by its absence

Idioms  

1. Also, conspicuous by one's absence. Glaringly obvious by the fact of not being there. For example, One agenda item concerning publicity is conspicuous by its absence, or The bride's father was conspicuous by his absence. The idea is ancient; it was expressed by the Roman writer Tacitus, concerning the absence of Junia's brother and husband at her funeral procession. [Mid-1800s]

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Example Sentences

While the article mentions measures such as increased security, more accessible mental health resources and improving connections between students, families and staff, conspicuous by its absence is any discussion of the one thing that could make the biggest difference with respect to student safety and health: education!

From Seattle Times

While the Russian delegation will be conspicuous by its absence, organisers hailed a record turnout in terms of the number and diversity of participants, with expectations of a "high-level" Chinese presence.

From Reuters

The Federal Reserve has tried to smooth the economic cycle, but the “great moderation,” a term popularized in 2004 by Ben S. Bernanke, the former Fed chairman, is conspicuous by its absence.

From New York Times

It was the Armata T-14 tank that turned heads on Victory Day in 2015, but it has been conspicuous by its absence in the war in Ukraine, because it is not yet ready for frontline combat.

From BBC

In this state-controlled sphere, the war is most conspicuous by its absence.

From Washington Post