qū​qū

insignificant

区区 (區區) qū​qū
insignificant noun
trivial, trifling, or of little importance

It's really not worth getting angry over such a trivial matter.

merely descriptive
just or only a small amount or number

He finished this arduous task in just a few days.

Frequency

Movie subtitles
1.28 per million appears in 1% of films
Written text
4.26 per million

Sources

Definitions
CC-CEDICT