undull

adj, verb — 2 senses

adj

Etymology From Middle English undull, equivalent to un- (“not”) + dull.

Not dull; sharp.

verb

Etymology From un- + dull.

To make less dull (various senses).

It is a most musicall Modulator of all Intelligibles by her inventive Variations, undulling their Grossenesse, and subliming it into more refined Acceptablenesse to our own, or others understandings.1654, Richard Whitlock, Zootomia; Or, Observations on the Present Manners of the English:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.