richtig
correct
Accurate, error-free, or corresponding to the truth.
Das ist die richtige Antwort.
That is the correct answer.

correct / right
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correct
Accurate, error-free, or corresponding to the truth.
Das ist die richtige Antwort.
That is the correct answer.

'Richtig' comes from 'richten' (to direct/set right) and 'Richtung' (direction). The basic idea is that something is aligned in the correct direction or made straight. This helps you understand the meanings 'correct' and 'suitable'.
Bitte zeig mir die richtige Richtung zum Bahnhof.
Please show me the right direction to the train station.
When 'richtig' comes before an adjective or adverb and is not declined, it means 'very' or 'really'. This use is more colloquial.
Der Film war richtig spannend.
The film was really exciting.
In the meaning 'suitable', 'richtig' is often used in reference to people, decisions, or moments: 'der richtige Partner' (the right partner), 'die richtige Wahl' (the right choice), 'zur richtigen Zeit' (at the right time).
Es ist wichtig, die richtige Entscheidung zu treffen.
It is important to make the right decision.
The meaning 'real' or 'full-fledged' is often used to create a contrast with something temporary, incomplete, or an imitation.
Nach der Ausbildung hat er endlich einen richtigen Job gefunden.
After his training, he finally found a proper job.
very
'sehr' and 'richtig' can both be used for strong emphasis. In sentences like 'sehr gut' (very good) and 'richtig gut' (really good), the meaning is very similar. 'sehr' is neutral and fits in almost all situations. 'richtig' often sounds a bit more conversational and lively; it emphasizes that something really is strongly or clearly that way. In formal texts, 'sehr' is usually more natural; in everyday language, 'richtig' is very common.

Nach dem Training war Max richtig erschöpft.
After training, Max was really exhausted.
Hannes findet den neuen Supermarkt sehr praktisch.
Hannes finds the new supermarket very convenient.