pestilent
Concise Oxford English Dictionary © 2008 Oxford University Press:
pestilent/ˈpɛstɪl(ə)nt/
▶adjective
- 1 deadly.
- 2 informal, dated annoying.
- 3 archaic harmful to morals or public order.
– derivatives
pestilently adverb.
pestilently adverb.
– origin ME: from L. pestilens, pestilent- ‘unhealthy, destructive’, from pestis ‘plague’.
'pestilent' also found in these Oxford entries:

