HSK 6
沉重
chénzhòng形
heavy; hard; serious; critical
这个箱子比想象中沉重。
Zhè ge xiāng zi bǐ xiǎng xiàng zhōng chén zhòng.
This box is heavier than expected.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.