(1) The doctor then went on to add with even further disgust, u2018the clinic has become as ubiquitous as the mosquito in a swamp and equally pestiferous .u2019(2) Newly drafted in from Europe for the most part, they died like flies in the pestiferous climate.(3) 1 Happy the man who did not walk by the counsel of the impious, or stand in the way of sinners, or sit down in the seat of pestiferous people.(4) I was a librarian but I was the world's worst reference librarian. It was always my pleasure to tell the student to look it up for himself and not to bother me with his pestiferous inquiries.