MON'STROUS, adjective [Latin monstrosus.] Unnatural in form; out of the common course of nature; as a monstrous birth or production. 1. Strange; very wonderful; generally expressive of dislike. 2. Enormous; huge; extraordinary; as a monstrous highth; a monstrous tree or mountain. 3. Shocking to the sight or other senses; hateful. MON'STROUS, adverb Exceedingly; very much; as monstrous hard; monstrous thick. And will be monstrous witty on the poor. [This use is colloquial and vulgar.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI