conspicuous by absence
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conspicuous by (one's)/its absence
Especially noticeable because of being missing or absent (from something). You're the loudest one in the class, so of course you're conspicuous by your absence! The governor's economic stimulus plan was conspicuous by its absence during his speech this afternoon.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
*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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.