
missachten
to disregard
To deliberately ignore or fail to follow a rule, law, instruction, or order.
Wer die rote Ampel missachtet, riskiert einen schweren Unfall.
Anyone who disregards a red light risks a serious accident.
to disregard
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to disregard
To deliberately ignore or fail to follow a rule, law, instruction, or order.
Wer die rote Ampel missachtet, riskiert einen schweren Unfall.
Anyone who disregards a red light risks a serious accident.

to disregard
To show a person no respect or regard; to look down on or ignore someone.
Er fühlte sich von seinen Kollegen missachtet, da sie seine Vorschläge nie ernst nahmen.
He felt disregarded by his colleagues because they never took his suggestions seriously.
The verb consists of the prefix 'miss-' and the verb 'achten' (to respect/pay attention to). The prefix 'miss-' always expresses something negative or wrong, as also in 'Missverständnis' (misunderstanding) or 'misslingen' (to fail). So 'missachten' (to disregard) literally means not to give someone or something the necessary respect or attention.
Er hat meine Anweisungen komplett missachtet.
He completely disregarded my instructions.
'Missachten' (to disregard) is an inseparable verb. The prefix 'miss-' remains firmly attached to the verb stem in all tenses and sentence constructions.
Sie missachtet die Verkehrsregeln.
She disregards the traffic rules.
The verb 'missachten' (to disregard) always requires a direct object in the accusative. You ask: Whom or what is being disregarded? This object is the person, rule, or thing that is being ignored.
Der Radfahrer missachtete das Stoppschild.
The cyclist disregarded the stop sign.
When it is about rules, 'missachten' (to disregard) is often combined with nouns such as 'Gesetz' (law), 'Vorschrift' (regulation), 'Befehl' (order), or 'Warnung' (warning).
Wer die Sicherheitsvorschriften missachtet, gefährdet sich und andere.
Anyone who disregards the safety regulations endangers themselves and others.
to injure / hurt / violate
Both verbs can be used when a rule is not followed. Missachten emphasizes that someone deliberately ignores the rule; verletzen refers to the violation that results. When the focus is on deliberately disregarding the rule, missachten is appropriate; for the violation itself, verletzen is more suitable.

Obwohl er die Anweisung kennt, missachtet er die Sicherheitsregel und öffnet die Tür.
Although he knows the instruction, he disregards the safety rule and opens the door.
Indem er die gesperrte Tür öffnet, verletzt er die Sicherheitsregel.
By opening the door marked off-limits, he violates the safety rule.