In a wild, boisterous, or rowdy manner; an archaic adverbial form likely rarely used in modern English.
Formed from 'deboist' plus the '-ly' suffix, creating an adverb. This follows standard English word-formation patterns, though the base adjective itself is rare.
When a word is this rare, the adverb form is rarer still—'deboistly' might be one of those words that was technically possible in English but so few people used it that it's virtually disappeared.
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