1.
desertion, leaving behind
The act of abandoning someone or something in a place without taking them along.
2.
being left out, falling behind
A state where someone or something is neglected or fails to keep up with progress.
Related Words
Related:
取り残す (to leave behind)
Related:
見捨てる (to abandon, to desert)
Related:
放置する (to leave unattended)