ironic

"My brother's opinion is the opposite of mine on the best way to study for the exam. "

"The student, known for being incredibly organized, ironically forgot his homework, resulting in a low grade. "

"It was a coincidental meeting; we both happened to be at the grocery store at the same time. "

"Joe was always complaining about the noise made by his neighbours."

"The school principal is constituting a new student advisory board to improve communication. "

"The contrary of a good report card is a bad one. "

"My complaint about the noisy neighbors was finally heard by the landlord. "

"Actually, I had nothing to do with that incident."

"Her sarcastic tone made it clear she didn't believe a word he said. "

"The complicated instructions on the new software difficult me from completing the project on time. "

"The teacher characterized the student as disruptive in class. "

"He never expected to be discovered."