In a gummy or gum-like manner; with qualities characteristic of gum, such as stickiness or viscosity.
Formed from 'gum' plus the adverbial suffix '-ly'; creates an adverb describing actions or qualities done in a gum-like way.
The adverb 'gumly' is rarely used in modern English, but it shows how our ancestors had precise words for everything—when describing textures mattered more in a tactile, pre-industrial world.
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