HSK 7-9
黏
nián形
sticky; glutinous; (Tw) to adhere; to stick on; to glue
胶水太黏，沾到了手指。
Jiāoshuǐ tài nián, zhāndào le shǒuzhǐ.
The glue was so sticky that it got on my fingers.
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Hold the button, say it, then let go.
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.