nichts
nothing
Indefinite pronoun that indicates the absence of everything or the opposite of 'etwas' (something); no thing.
Ich habe den ganzen Tag noch nichts gegessen.
I haven’t eaten anything all day.

nothing
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nothing
Indefinite pronoun that indicates the absence of everything or the opposite of 'etwas' (something); no thing.
Ich habe den ganzen Tag noch nichts gegessen.
I haven’t eaten anything all day.

In German, there is no double negation. The word 'nichts' (nothing) alone makes the sentence negative. You do not use it together with 'nicht' (not).
Ich sehe nichts.
I see nothing.
Just like 'etwas' (something), 'nichts' (nothing) is an invariable pronoun. It is never declined and always keeps the same form.
Ich habe Angst vor nichts.
I am afraid of nothing.
An adjective can follow 'nichts' (nothing). It is then capitalized and takes the ending for neuter nouns in the singular (-es).
Heute ist nichts Besonderes passiert.
Nothing special happened today.
To emphasize 'nichts' (nothing), the word 'gar' is often placed before it. The combination 'gar nichts' means 'absolutely nothing' or 'nothing at all'.
Ich habe heute noch gar nichts getrunken.
I haven’t drunk anything at all today.
'Nichts für ungut' (no offense) is a fixed expression. You use it to soften a critical or potentially hurtful statement.
Nichts für ungut, aber deine neue Frisur gefällt mir nicht so gut.
No offense, but I don’t like your new hairstyle very much.
The expression 'Nichts da!' (No way!) is a very direct and colloquial way to firmly reject a request or suggestion. It is not rude, but very definite.
Kann ich mir 20 Euro leihen? – Nichts da, du hast mir die letzten auch nicht zurückgegeben!
Can I borrow 20 euros? – No way, you didn’t pay back the last money you borrowed from me either!
something / somewhat
'etwas' and 'nichts' are clear opposites. 'etwas' means an unspecified thing or a small amount. 'nichts' means that no thing is there or that no amount is present. Learners may confuse the words because both often appear without a specific noun. A practical rule is: if at least one thing or a small amount is present, 'etwas' fits. If no thing at all is present, 'nichts' fits.

Nach dem Gespräch sagt sie nichts mehr zu ihrer Kollegin.
After the conversation, she says nothing more to her colleague.
Für das Projekt brauchen wir noch etwas Geld.
We still need some money for the project.