conspicuous by absence
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conspicuous by (one's) absence
Noticeably missing from something. You're the loudest one in the class, so of course you're conspicuous by your absence!
*conspicuous by one's absence
Cliché noticeably absent (from an event). (*Typically: be ~; made ~.) How could the bride's father miss the wedding? He was certainly conspicuous by his absence.