pestiferous

 
Pronunciation: /pɛˈstɪf(ə)rəs/

adjective

literary
  • harbouring infection and disease: the pestiferous area around the prison
  • humorous constituting a nuisance; very annoying: that pestiferous nephew of yours

Origin:

late Middle English (in the sense 'morally corrupting'): from Latin pestifer 'bringing pestilence' + -ous