unserious

"It is very important to give your daughter independence in her life so she learns from experience."

"What is your question?"

"Her answer to his proposal was a slap in the face."

"His deep laughs boomed through the room."

"It was a surprise to see the captain, who had always seemed so serious, laugh so heartily."

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

"The intricate making of the model airplane showcased the student's skill. "

"Professor Smith, the head of the history department, gave a fascinating lecture on the Roman Empire. "

"Everyone in the class needs to bring their textbook to the first lecture. "

"When asked about the serious accident, the teenager gave a flippant answer, as if it were no big deal. "

"I will do it, though."

"The difficult exam was a real test of her knowledge. "