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Syllabification: per·turb
Pronunciation: /pərˈtərb

Definition of perturb in English:


[with object]
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 loans
More example sentences
  • 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.
informal rattle, throw
worried, 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, unstrung
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 asteroid
More 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.


late Middle English: from Old French pertourber, from Latin perturbare, from per- 'completely' + turbare 'disturb'.





Pronunciation: /ˈpərtərˌbātiv, pərˈtərbətiv/
sense 2.
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.



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