PER'ILOUS, adjective Dangerous; hazardous; full of risk; as a perilous undertaking; a perilous situation. 1. Vulgarly used for very, like mighty; as perilous shrewd. 2. Smart; witty; as a perilous [parlous boy.] [Vulgar and obsolete.]
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI