HSK 4
究竟
jiūjìng副（名）
Meaning
to go to the bottom of a matter; after all; when all is said and done; (in an interrogative sentence) finally
Stroke order
Appears across levels (4（5）) in the HSK 3.0 word list.
to go to the bottom of a matter; after all; when all is said and done; (in an interrogative sentence) finally