infested
adj. B2 Upper Intermediate US //ˌɪnˈfɛstɪd// UK //ɪnfˈɛstɪd// in·fest·ed
adj. full of something unpleasant or dangerous, like insects, rats, or weeds.
adj. present in large numbers so as to be unpleasant, harmful, or dangerous. A participial adjective often used predicatively after 'be' or 'become'.
The old kitchen was infested with ants.
After the flood, the abandoned basement became infested with mold and mosquitoes.
The local authorities warned that the lake had become infested with invasive weeds that were choking the native ecosystem and preventing recreational boating.
Usage
Typically takes the preposition 'with' followed by the source of the problem.
Pitfall
The house was infested of cockroaches.The house was infested with cockroaches.Infested requires the preposition 'with' rather than 'of' or 'by'.