In a manner characterized by drafts or air currents; in a way that is exposed to wind or moving air.
Adverbial form of 'draughty' with the -ly suffix, transforming the adjective into an adverb that describes how something happens or exists in a drafty manner.
Adding '-ly' to make adverbs is so common we barely notice it, but it's one of English's most productive word-building tricks—almost any adjective becomes an adverb this way, letting us describe how things happen or exist.
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