ETYMOLOGY
Middle English: in sense adj. 1, from broth (impetuous, violent, wrathful) + -ly;
sense adj. 2, possibly a derivative of brothel
EXAMPLE (for adj. 1)
“… þan said Isaac tille him, “ert þou his mayntenour?
Fulle broþely & brim he kept vp a trencheour,
& kast it at Statin, did him a schamfulle schoure.
His nese & his ine he carfe at misauentoure. …”
From: Peter Langtoft’s Chronicle, (as illustrated and improv’d by Robert of Brunne), 1330
Lexicophilia 