Quaver

The teacher's quaver made it hard for the students to understand the lesson.

The wind had a quaver that shook the windows of the house.

The sound of the earthquake had a quaver that made the ground shake.

The toddler's voice had a quaver as she called out for her mother.

The actor's voice had a quaver as he delivered his lines, making the audience emotional.

The patient's voice had a quaver as she talked about her illness with the doctor.

His voice began to quaver as he spoke about the accident.

The music teacher instructed her student to practice the difficult quaver passage in the piece.