The phrase "unfortunate omission" means that something important or necessary was accidentally left out or forgotten, causing a negative result or outcome. Full definition
The only unfortunate omissions are the lack of a heart rate sensor and NFC. (thenextweb.com)
, Kirby, Pro Wresting, or StarTropics seem more like unfortunate omissions, especially when compared to games like Golf. (thedreadpirateguy.com)
Still, the fine new Jonathan Demme interview makes it a bit easier to overlook the untimeliness of this release, the lack of a Blu - ray edition, and the unfortunate omission of subtitles and captioning. (dvdizzy.com)