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loose
flimsy
weak
fragile
The roof is structurally unsound.
Leaves aren't strong, and sticks aren't strong, either.

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Open the tool →不牢固 (bù láo gù) means “unstable, loose, flimsy, weak”.
不牢固 is pronounced bù láo gù in Mandarin Chinese.
“unstable” is 不牢固 (bù láo gù) in Chinese.
This page has 2 example sentences using 不牢固, each with pinyin and an English translation.