stark
strong
Has a lot of physical strength.
Er ist stark genug, um die schwere Kiste allein zu tragen.
He is strong enough to carry the heavy box by himself.

strong
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strong
Has a lot of physical strength.
Er ist stark genug, um die schwere Kiste allein zu tragen.
He is strong enough to carry the heavy box by himself.

'Stark' (strong) can be used like an adverb to intensify a verb or another adjective. It then means 'very' or 'intensely'.
Es hat die ganze Nacht stark geregnet.
It rained heavily all night.
The adjective 'stark' (strong) belongs to a word family with the noun 'die Stärke' (strength) and the verb 'stärken' (to strengthen, to make something strong). This connection helps with understanding and usage.
Regelmäßiger Sport stärkt das Immunsystem.
Regular exercise strengthens the immune system.
To express intensity, 'stark' (strong) is often combined with natural phenomena, feelings, or sensory impressions. Common examples are 'starker Wind' (strong wind), 'starker Verkehr' (heavy traffic), 'starke Schmerzen' (severe pain), or 'ein starker Geruch' (a strong smell).
Wegen des starken Nebels konnte man kaum etwas sehen.
Because of the thick fog, you could hardly see anything.
In connection with drinks, foods, or medications, 'stark' (strong) means that something has a high concentration of a particular ingredient. Typical examples are strong coffee, strong tea, or heavily spiced food.
Dieser Kaffee ist sehr stark, ich kann danach nicht schlafen.
This coffee is very strong; I can't sleep after drinking it.
In colloquial language, 'Stark!' can be used as a single word or short sentence to express admiration or approval. It then means something like 'Great!' or 'Impressive!'.
Du hast den Marathon geschafft? Stark!
You finished the marathon? Awesome!
The meaning 'starkes Verb' (strong verb) is a technical term from grammar. You will encounter this word in textbooks or German class when it comes to the conjugation of irregular verbs.
In der Liste musst du alle starken Verben markieren.
In the list, you have to mark all the strong verbs.
very
'sehr' and 'stark' can both express that something is present to a high degree. 'sehr' is a general intensifier and often comes before adjectives or adverbs. 'stark' more often describes high intensity, for example with wind, rain, pain, feelings, or changes. Learners may confuse the words because both express an increase in degree. A practical tip: 'sehr' fits very broadly, while 'stark' fits especially well when you mean force, effect, or intensity.

Für die Präsentation brauchen wir im Besprechungsraum ein starkes WLAN-Signal.
For the presentation, we need a strong Wi-Fi signal in the meeting room.
Nach der Nachricht war die Stimmung im Büro sehr ruhig.
After the news, the mood in the office was very calm.