irritant

"What irritation causes you to be so moody?"

"The teacher is requiring students to submit their essays by Friday. "

"The new student is potentially a star athlete; she runs very fast and jumps high. "

"The constant noise from the construction site made it hard to concentrate on my homework. "

"The store will give you a discount on your purchase, conditionally on spending at least $50. "

"The inflammation of the dry leaves by the bonfire was quite impressive. "

"The missing signature on the contract is invalidating the entire agreement. "

"The family used arbitration to settle their disagreement about who got to use the backyard trampoline. "

"My grandmother takes several medications for her high blood pressure. "

"The doctor prescribed aspirin."

"The students designed posters for the school fair. "

"The shot rendered her immobile."