The word "perturb" is correct and usable in written English.
You can use it to mean cause to be anxious or upset. For example: "The new regulations have perturbed the employees of the company."
He showed that gravitational perturbations by random passing stars would perturb the orbits in the comet cloud, occasionally sending a comet into the planetary region where it could be observed.
In Secret Agent, moral scruples perturb the decent English while, killer and clown, Hispanic Peter Lorre finds the murder business ludicrously comic.
But for the Tories to be roughly where they were at the last election should really perturb Mr Miliband's strategists.
Their verdict, "like meat" but "not that juicy", did not perturb Mark Post of Maastricht University, who grew the beef.
But what it reveals about Labour's view of the world (that Iraq, cosying up to the rich and stealing Tory clothes were the real sins of the last government, not reckless over-spending) will perturb many.Finally, the sight and sound of the Labour leader are still very serious problems for him.
It feels natural to those of us who grew up with it, but British banter the playfully barbed conversational style adopted by groups of friends in bars, offices and even classrooms up and down the country can baffle and perturb foreigners.
Strangely, such censure might perturb Mr Mugabe, whose contempt for democracy coexists with a puzzling desire for respectability.
"Words perturb our powers of reason," he wrote once.
He says that the price of India's favourite vegetable is a mystery that no calculation can explain.High food prices perturb some men and women even bigger than Mr Jain.
BRITONS who believe they are unduly snooped on seldom want for proof: CCTV cameras and DNA databases perturb many in a country famous for its attachment to privacy.
The apparently sublime power of the volcano was largely the result of an initially supine reaction.Very few events are able to perturb an increasingly globalised world.
