Of an object: not strong or sturdy, as because of poor construction or upkeep; not safe or secure.
He hesitated about climbing such a small, rickety ladder.
From dialectal ricket (“unstable, rickety”) + -y, and/or ricket (“to move noisily and in a reckless way”) + -y. Alternatively, and perhaps less likely, from rickets + -y.
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Feeble in the joints; tottering.
The rickety old man hardly managed to climb the stairs.
Affected with or suffering from rickets; rachitic.