irascible

"You need to control your anger."

"The new math homework was easily understood by the students. "

"My sister is quite happy with her new job. "

"to have a good, bad, or calm temper"

"My younger brother counted the evens in his math homework. "

"the delay before the echo of a sound"

"The child's small was sore after carrying his heavy backpack to school. "

"Her constant complaining provoked her mother. "

"My grandpa told me a funny story about his childhood. "

"The normally quiet student surprised everyone with sudden outbursts of anger during the difficult exam. "

"My dinner was a sandwich and some fruit, before I went to my afternoon class. "

"My sister is very irritable this week; she's easily annoyed by small things. "