* Formal: The scientist's carefully planned experiment was perturbed by an unexpected power outage.
* Informal: I was perturbed by the loud noise coming from the apartment next door.
* Emotional: She was deeply perturbed by the news of her friend's accident.
* Technical: The addition of a small amount of impurities perturbed the crystal structure of the material.
* Figurative: His calm facade was perturbed by the sudden appearance of his ex-girlfriend.
The word "perturbed" implies a state of being disturbed or unsettled, either physically or emotionally. It's a more formal and slightly stronger word than "disturbed" or "upset."