disastrous / fatal
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disastrous
Associated with disastrous, catastrophic, or very negative consequences. Describes an action or event that leads to great misfortune or failure.
Es war ein fataler Fehler, die Sicherheitswarnungen zu ignorieren.
It was a disastrous mistake to ignore the safety warnings.
Careful: 'fatal' in German usually means 'verhängnisvoll' (disastrous) or 'katastrophal' (catastrophic). In English, 'fatal' almost always means 'tödlich' (deadly). Although 'fatal' in German can also mean 'tödlich' (deadly), that is much rarer.
Die Entscheidung, ohne Karte loszugehen, war fatal.
The decision to set off without a map was disastrous.
The meaning depends strongly on the noun. 'Ein fataler Fehler' (a disastrous mistake) is disastrous. 'Eine fatale Verletzung' (a fatal injury) is deadly (formal). 'Ein fataler Versprecher' (an embarrassing slip of the tongue) is extremely embarrassing (colloquial).
Sein Zögern in dieser Situation hatte fatale Folgen.
His hesitation in this situation had disastrous consequences.
In its most common meaning ('verhängnisvoll' — disastrous), 'fatal' is often combined with abstract nouns that describe an action or its result. Typical examples are: 'ein fataler Fehler' (a disastrous mistake), 'eine fatale Entscheidung' (a disastrous decision), or 'fatale Folgen' (disastrous consequences).
Das war ein fataler Irrtum mit weitreichenden Konsequenzen.
That was a disastrous misconception with far-reaching consequences.
The meaning 'tödlich' (deadly/fatal) is rare and is used almost only in very formal, scientific, or medical contexts. You might read it, for example, in a medical report or a scientific study.
Die eingenommene Menge des Medikaments hatte eine fatale Wirkung.
The amount of the medication that was taken had a fatal effect.
When 'fatal' describes a very embarrassing situation, it has a rather colloquial character. It expresses in an exaggerated way how unpleasant something was.
Es war fatal: Mitten in meiner Rede fiel der Strom aus.
It was embarrassing: right in the middle of my speech, the power went out.
embarrassing / meticulous
'peinlich' and 'fatal' can both describe a very unpleasant situation. 'peinlich' mainly refers to shame or embarrassment, meaning how someone feels in a situation. 'fatal' is stronger and often means that something has very negative consequences. In some everyday situations, 'fatal' can also mean 'very embarrassing' or 'very unfortunate', but it sounds more dramatic than 'peinlich'. If you only mean an uncomfortable moment, 'peinlich' fits better. If a mistake can have serious consequences, 'fatal' is more precise.
Ein falsches Datum im Vertrag kann für die Firma fatal sein.
A wrong date in the contract can be disastrous for the company.
Vor der ganzen Klasse die Antwort zu vergessen, war ihm sehr peinlich.
Forgetting the answer in front of the whole class was very embarrassing for him.