pestilential
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/ˌpestɪˈlenʃl/
🇬🇧
/ˌpestɪˈlenʃl/
Very irritating or causing great discomfort.
The constant noise from the construction site was pestilential.
Causing or related to a disease that spreads quickly and is deadly.
The pestilential conditions in the city led to a rapid spread of the plague.