vernachlässigen

hat vernachlässigt

vernachlässigte

Meanings

to neglect, to ignore

(For relationships or people, when you actually should invest some more time. Negative tone.)

to ignore, to leave aside, to disregard

(For information or data, usually in a scientific sense. Often done on purpose to simplify things, so this one doesn't sound negative.)

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The core idea of this root was:

letting go, slacken off, relenting

And we can still see this sense in the English offspring, like last, let, lenient, latter or late.

By the way, the words relax and and release, though they would fit in here, apparently come from a different root.