richly

The adverb "richly" is built upon the adjective "rich," whose journey to meaning "wealthy" is one of power transfer. Its ultimate source is the Proto-Celtic word rīgos, meaning "king." This entered early Germanic via the Proto-Germanic rīkijaz, signifying "powerful, noble," a sense directly tied to rulership. Over time in Old English (rīċe), the meaning expanded from the power of a ruler to encompass the material abundance that such power commands, solidifying the modern sense of "wealthy." The adverbial suffix "-ly," of ancient Germanic origin, is then seamlessly appended, transforming the adjective into a modifier that describes the manner of an action—doing something in a kingly, abundant, or full way.

Structure: rich (wealthy, abundant) + ly (adverb-forming suffix) - rich: From Old English rīċe ("powerful, wealthy"), from Proto-Germanic rīkijaz, from Proto-Celtic rīgos ("king"). In this word, it functions as the core adjective root denoting abundance. - ly: From Old English -līċe (adverbial suffix), from Proto-Germanic -līkō. It functions as a derivational suffix converting the adjective into an adverb.