In a manner that is capable of being described; in a way that can be put into words or explained.
From describable + -ly adverbial suffix, creating an adverb modifying verbs or adjectives to describe actions or states that can be articulated.
This adverb is rare but useful—'describably good' means it's good in a way you can actually articulate, unlike indescribable goodness that leaves you speechless.
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