
tough
Colloquial for hard, difficult, or demanding.
Die Prüfung war echt tough, aber ich glaube, ich habe sie bestanden.
The exam was really tough, but I think I passed it.
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Colloquial for hard, difficult, or demanding.
Die Prüfung war echt tough, aber ich glaube, ich habe sie bestanden.
The exam was really tough, but I think I passed it.

Colloquial for a person who is resilient, robust, and not easily intimidated.
Sie ist eine toughe Verhandlungspartnerin und gibt nicht so schnell auf.
She is a tough negotiation partner and does not give up easily.
'Tough' is a word borrowed from English and is used especially in colloquial language. The pronunciation is based on the English pronunciation.
Das war ein tougher Tag im Büro.
That was a tough day at the office.
Although it is an English word, 'tough' is declined like a normal German adjective when it comes before a noun.
Er ist ein tougher Gegner im Tennis.
He is a tough opponent in tennis.
When 'tough' describes a person, it means that they are resilient and mentally strong. If it refers to a thing or situation, it means 'schwierig' (difficult) or 'anstrengend' (strenuous).
Meine Chefin ist eine wirklich toughe Frau.
My boss is a really tough woman.
hard
Both hart and tough can describe a difficult, demanding task. Hart is neutral in standard German and can emphasize trying conditions; tough is distinctly colloquial. Hart is therefore more suitable in a factual text, while tough can also be used in a casual conversation.

Nach der Prüfung sagte Mia zu ihrer Freundin, dass sie echt tough war.
After the exam, Mia told her friend that it had been really tough.
Im Bericht steht, dass die Prüfung für alle Teilnehmer hart war.
The report says that the exam was hard for all the participants.