ziemlich
pretty / fairly
Expresses a considerable but not extreme degree; quite, relatively, pretty.
Der Film war ziemlich gut, aber nicht der beste, den ich je gesehen habe.
The film was pretty good, but not the best I've ever seen.

pretty / fairly
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pretty / fairly
Expresses a considerable but not extreme degree; quite, relatively, pretty.
Der Film war ziemlich gut, aber nicht der beste, den ich je gesehen habe.
The film was pretty good, but not the best I've ever seen.

'Ziemlich' (pretty/fairly) stands as an adverb directly before the adjective or adverb that it modifies. It describes the degree or intensity of this quality.
Das Wasser im See ist schon ziemlich kalt.
The water in the lake is already pretty cold.
'Ziemlich' (pretty/fairly) is very typical of spoken language and informal texts. It expresses a considerable degree without sounding exaggerated.
Ich musste heute ziemlich lange auf den Bus warten.
I had to wait for the bus for quite a long time today.
Most of the time, 'ziemlich' means 'recht' (quite) or 'relativ' (relatively). In combination with words like 'genau' (exactly) or 'gleich' (the same), the meaning changes to 'almost' or 'approximately'.
Das neue Restaurant ist ziemlich teuer.
The new restaurant is pretty expensive.
something / somewhat
'etwas' and 'ziemlich' can both change the degree of a quality. 'etwas' means 'a little' and makes the statement weak. 'ziemlich' means 'quite' or 'relatively' and makes the statement stronger, but not extreme. They can be confused because both can come before adjectives. The difference is intensity: 'etwas kalt' is only slightly cold, while 'ziemlich kalt' is noticeably cold.

In der Pause war es im Büro ziemlich laut.
During the break, it was quite loud in the office.
Die Lehrerin hat die Aufgabe etwas anders erklärt als im Buch.
The teacher explained the assignment somewhat differently than in the book.