1) Epidemic 2) Pestiferous 3) Pestilent 4) Plaguey 1) Epidemic 2) Plaguey 
• (a.) Having the nature or qualities of a pestilence. • (a.) Hence: Mischievous; noxious; pernicious; morally destructive.
Relating to or tending to produce a pestilence. ... Synonym: pestiferous. ... (05 Mar 2000) ... 
Pes`ti·len'tial adjective [ Confer French pestilentiel .] 1. Having the nature or qualities of a pestilence. 'Sends the pestilential vapors.' Longfellow. 2. Hence: Mischievous; noxious; pernicious; morally destructive. « So pestilential , so infecti...
Type: Term Pronunciation: pes′ti-len′shăl Definitions: 1. Relating to or tending to produce a pestilence. Synonyms: pestiferous
pestilential Relating to or tending to produce a pestilence (disease known as the plague; hence, any contagious or infectious epidemic disease that is virulent and devastating).