
etwas
something
As a pronoun, it refers to an unspecified thing or situation; some thing.
Ich habe im Kühlschrank etwas Leckeres für dich gefunden.
I found something delicious for you in the fridge.
something / somewhat
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something
As a pronoun, it refers to an unspecified thing or situation; some thing.
Ich habe im Kühlschrank etwas Leckeres für dich gefunden.
I found something delicious for you in the fridge.

some
As a pronoun, it refers to a small, unspecified amount of something; a little.
Möchtest du etwas Zucker in deinen Tee?
Would you like some sugar in your tea?

somewhat
As an adverb, it means 'a little', 'to a small degree', or 'slightly'.
Die Suppe ist etwas zu salzig.
The soup is somewhat too salty.
The word 'etwas' (something/somewhat) is invariable. It is never declined and always keeps the same form, no matter which case it is in.
Ich brauche etwas Zeit.
I need some time.
When 'etwas' (something) is combined with an adjective, the adjective is capitalized and gets the ending for neuter nouns in the singular (-es).
Ich möchte dir etwas Schönes schenken.
I would like to give you something nice.
When 'etwas' (some) stands before a noun to express an unspecified amount, the noun is not declined and remains in the singular. These are usually uncountable things.
Ich habe noch etwas Geld übrig.
I still have some money left.
As an adverb, 'etwas' (somewhat) stands directly before an adjective or another adverb and means 'a little' or 'a bit'. The adjective is then written in lowercase.
Dieser Koffer ist etwas schwer.
This suitcase is somewhat heavy.
little / few
Etwas and wenig can both refer to a small amount that is available. Etwas presents the limited amount more neutrally, while wenig emphasizes that the amount is small or possibly insufficient. Use etwas for a neutral statement and wenig when the scarcity is important.

Für die Aufgabe habe ich noch etwas Zeit.
I still have some time for the task.
Für die Aufgabe habe ich nur wenig Zeit.
I have very little time for the task.