agood
adv/əˈɡʊd/
Etymology From a- + good.
1
Obsolete In earnest; heartily; in good earnest.
- […]And, at that time I made her weep a-good, / For I did play a lamentable part:c. 1590–1591 (date written), William Shakespeare, “The Two Gentlemen of Verona”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act IV, scene iv]: