pernicious

"The farmer sprayed pesticide on his crops to protect them from insects. "

"Be careful not to damage any of the fragile items while unpacking them."

"The passenger sustained a severe injury in the car accident."

"Be careful what you say to him: he’s a bit of a gossip."

"The divers encountered a huge school of mackerel."

"The teacher explained the new math concept quickly. "

"The dry-stone wall used a large, flat through to support the top stones. "

"I have absolutely no influence over him."

"The difference is subtle, but you can hear it if you listen carefully."

"Developing strong friendships is important for happiness and well-being. "

"The spread of the flu was rapid in the school this week. "

"The lightning caused thunder."