Watch the stroke order, then trace it yourself.
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An ancient (古) enclosure (囗) — something old and firmly established, hence solid or fixed.
Download and print worksheets to practice writing 固

HSK words that contain this character.
Real-world example sentences demonstrating how 固 is used in context
He is smart indeed, but not hardworking enough.
根深蒂固
gēn shēn dì gù
ingrained; inveterate; deep-seated
Please fix the bookshelf to the wall.
This bridge is built very sturdy.