Comparative form of 'chinky,' meaning more full of chinks (cracks or small openings) or more characterized by chinking sounds.
From 'chinky' (full of chinks, or making chink sounds) plus '-er' comparative suffix, following standard English adjective gradation patterns.
This comparative form shows how frontier vocabulary became formalized—settlers needed to describe quality of construction, so 'chinkier' literally meant 'has more gaps and will be colder this winter.'
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