Meaning of the word pestilential in English

What does pestilential mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

pestilential

US /ˌpes.təˈlen.ʃəl/
UK /ˌpes.tɪˈlen.ʃəl/

Adjective

relating to or causing very serious infectious disease that spreads quickly and kills large numbers of people:

Example:
Smallpox is clearly the worst of the pestilential diseases.