streng
strict
Refers to a person who demands strong discipline, consistently enforces rules, and is not very lenient.
Unsere Mathelehrerin ist sehr streng, aber wir lernen viel bei ihr.
Our math teacher is very strict, but we learn a lot from her.

strict
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strict
Refers to a person who demands strong discipline, consistently enforces rules, and is not very lenient.
Unsere Mathelehrerin ist sehr streng, aber wir lernen viel bei ihr.
Our math teacher is very strict, but we learn a lot from her.

In this meaning, 'streng' (strict) often describes people with authority. Typical combinations are 'strenge Eltern' (strict parents), 'ein strenger Lehrer' (a strict teacher), or 'ein strenger Chef' (a strict boss).
Mein Vater war sehr streng, als ich ein Kind war.
My father was very strict when I was a child.
When it comes to regulations, 'streng' (strict) is frequently used. For example, people speak of 'strengen Regeln' (strict rules), 'strengen Gesetzen' (strict laws), or 'strengen Kontrollen' (strict checks).
Am Flughafen gibt es strenge Sicherheitskontrollen.
There are strict security checks at the airport.
To describe an intense, often sharp smell or taste, 'streng' (strong) is used. For example, you say that something 'riecht streng' (smells strong) or has a 'strengen Geschmack' (strong taste).
Manche Käsesorten riechen sehr streng.
Some types of cheese smell very strong.
In connection with a lifestyle or diet, 'streng' (strict) means that it is followed consistently. Typical expressions are 'streng vegetarisch leben' (to live strictly vegetarian), 'streng gläubig sein' (to be devoutly religious), or 'eine strenge Diät halten' (to follow a strict diet).
Seit einem Jahr lebt sie streng vegan.
She has been living strictly vegan for a year.
hard
'hart' and 'streng' can both describe someone who gives in very little. 'streng' fits especially with people, rules, or requirements that must be followed exactly. It is often about discipline and clear rules. 'hart' sounds stronger and can also seem ruthless or very uncompromising, especially with a judgment or decision. Learners may confuse the words because a strict teacher can also seem harsh. 'streng' is more rule-related, while 'hart' emphasizes the harshness of the reaction or decision.

Unsere Lehrerin ist streng, wenn jemand die Hausaufgaben vergisst.
Our teacher is strict when someone forgets the homework.
Das Urteil des Chefs war hart, aber das Team verstand den Grund.
The boss's judgment was harsh, but the team understood the reason.