1. rickety, shaky, wobbly, wonky, unstable (vs. stable)

usage: inclined to shake as from weakness or defect; "a rickety table"; "a wobbly chair with shaky legs"; "the ladder felt a little wobbly"; "the bridge still stands though one of the arches is wonky"

2. shaky, shivering, trembling, unsteady (vs. steady)

usage: vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze; "a quaking bog"; "the quaking child asked for more"; "quivering leaves of a poplar tree"; "with shaking knees"; "seemed shaky on her feet"; "sparkling light from the shivering crystals of the chandelier"; "trembling hands"

3. precarious, shaky, insecure (vs. secure), unsafe

usage: not secure; beset with difficulties; "a shaky marriage"

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See also: shaky (Dictionary)