- 1Make (someone) anxious or unsettled: they were perturbed by her capricious behavior [with object and clause]: they were perturbed that the bank had begun switching some of its problem loansMore example sentences
worry, upset, unsettle, disturb, concern, trouble, disquiet; disconcert, discomfit, unnerve, alarm, bother, distress, dismay, gnaw at, agitate, fluster, ruffle, discountenanceworried, unsettled, disturbed, concerned, troubled, upset, anxious, ill at ease, uneasy, disquieted, fretful; disconcerted, discomposed, distressed, unnerved, alarmed, bothered, dismayed, agitated, flustered, ruffled, shaken, discountenanced• informal twitchy, rattled, fazed, unstrungdiscombobulated
- There are, probably, two principal concerns that will be perturbing the potential visitor.
- She was not perturbed by the low attendance, insisting that most people on the street supported her position.
- What perturbs me though is the complete lack of value I have received from my taxes, that I have faithfully paid towards public health over the years.
- 2Subject (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 asteroidMore example sentences
- Drugs perturb the system through increasing or decreasing transmission or transmitter levels, or up or down regulating receptor populations.
- It could change the heating structure of the atmosphere and perturb the climate system in ways we don't understand now.
- In this way, we see that the two systems engage in an exchange, a feedback loop of information and effect, which serves to further change or perturb each system.
- sense 2.More example sentences
- In the perturbative expansion of a gauge theory, large numbers of Feynman amplitudes combine to produce mathematically simple expressions.
- His logic, however, would have deprecated the early remarkable successes of perturbative quantum electrodynamics.
- Such measurements can then be compared with predictions of perturbative QCD, a relatively tractable corner of the full theory.
Pronunciation: /ˈpərtərˌbātiv, pərˈtərbətiv/adjective
late Middle English: from Old French pertourber, from Latin perturbare, from per- 'completely' + turbare 'disturb'.