feeling anxiety or concern; unsettled

she didn't seem perturbed about the noises around her

make (someone) anxious or unsettled

they were perturbed by her capricious behaviour

he was perturbed that his bleeper wouldn't work

subject (a system, moving object, or process) to an influence tending to alter its normal or regular state or path

nuclear weapons could be used to perturb the orbit of an asteroid