In a manner that is capable of burning or with ease of ignition; in a way that demonstrates flammability.
From 'combustible' plus the adverbial suffix '-ly' (from Old English 'lich,' meaning 'like' or 'in the manner of'). This adverb transforms the adjective into a descriptive modifier.
You might describe a situation as 'combustibly charged'—suggesting it could explode into conflict just as easily as dry wood ignites. The word jumped from chemistry into metaphor because burning and social conflict follow such similar patterns.
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