MON'STROUSLY, adverb In a manner out of the common order of nature; hence, shockingly; terribly; hideously; horribly; as a man monstrously wicked. 1. To a great degree; enormously; extravagantly. Who with his wife is monstrously in love.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI