In a way that is necessary, proper, or obligatory; as one ought to do something.
From 'behooving' plus '-ly' adverb suffix. Represents the adverbial form of a present participle, creating a double-layered construction that's mostly theoretical in modern English.
This word is virtually non-existent in actual use, but it's a perfect example of how English speakers can theoretically build multi-layered words by combining productive morphemes, even if they rarely do.
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