ver ‧ tig ‧ i ‧ nous /vɜːˈtɪdʒənəs, vɜːˈtɪdʒɪnəs $ vɜːr-/ BrE AmE adjective formal
[ Date: 1600-1700 ; Language: Latin ; Origin: vertiginosus , from vertigo ; ⇨ ↑ vertigo ]
so high that you feel sick and ↑ dizzy :
a vertiginous drop to the valley below