
unbeachtet
unnoticed / ignored
Not noticed or acknowledged by anyone; ignored or not taken into account.
Seine Warnungen blieben leider unbeachtet.
Unfortunately, his warnings went unheeded.
unnoticed / ignored
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unnoticed / ignored
Not noticed or acknowledged by anyone; ignored or not taken into account.
Seine Warnungen blieben leider unbeachtet.
Unfortunately, his warnings went unheeded.
The word is made up of the prefix 'un-' (a negation) and 'beachtet' (noticed / heeded). 'Beachtet' is the past participle of 'beachten' (to pay attention to something). So 'unbeachtet' literally means 'not noticed' or 'not heeded'.
Ein wichtiges Detail blieb bei der Planung völlig unbeachtet.
An important detail was completely overlooked during the planning.
A very common and useful combination is 'unbeachtet bleiben' (to go unnoticed / unheeded). This expression states passively that nobody noticed or took something into account.
Seine Vorschläge blieben in der Diskussion leider unbeachtet.
Unfortunately, his suggestions went unheeded in the discussion.
'Unbeachtet' is often used adverbially with the verb 'lassen' (to leave / let). The expression 'etwas unbeachtet lassen' means that someone deliberately ignores something or does not take it into account.
Der Manager hat die Kritik der Mitarbeiter einfach unbeachtet gelassen.
The manager simply ignored the employees' criticism.
to overlook / survey
Both expressions work when an important detail receives no attention. „Übersehen“ typically shows that someone failed to notice it accidentally, while „unbeachtet“ leaves the reason open. Use „übersehen“ for a specific oversight and „unbeachtet“ when only the result matters.

Die kleine Notiz am Ende des Dokuments blieb unbeachtet.
The small note at the end of the document went unnoticed.
Ich habe die kleine Notiz am Ende des Dokuments übersehen.
I overlooked the small note at the end of the document.