peligroso
/peliˈɡɾoso/ · A2 · adj
perilous, dangerous
☠️ peligro = peril: Latin periculum, with the r and l swapped, + -oso (-ous)
Latin periculum (danger) gave English peril and Spanish peligro, where the r and l traded places over time. Add -oso, the Spanish twin of English -ous, and peligroso is literally peril-ous.