the.com/dereliction

means The shameful neglect or abandonment of a duty, responsibility, or post you were supposed to look after.

from From Latin derelictio, built from the verb derelinquere — 'de' (entirely, thoroughly) plus 'relinquere' ('to leave behind,' the same root that gives us 'relinquish'). So at its root it means a total, complete leaving-behind — not just drifting away from something, but walking off and letting it rot. The word first described literal physical abandonment (a derelict ship, left to the waves) before settling into its sharper modern sense of abandoning a duty or obligation.