Meanings
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1
adj
chiefly dialectal: rickety, shaky, or poorly built
The shackly wagon rattled whenever its wheels struck a rut.
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2
adj
chiefly dialectal: loose-jointed or shambling in movement
The old horse moved with a shackly gait across the yard.
Thesaurus
Etymology
Probably formed from dialectal shackle, 'to shake or rattle,' plus -y. Both established senses are chiefly dialectal.