Definition of perturbation :
1. A disturbance in the regular elliptic or other motion of a heavenly body, produced by some force additional to that which causes its regular motion; as, the perturbations of the planets are caused by their attraction on each other.
2. The act of perturbing, or the state of being perturbed; esp., agitation of mind.
hoo-ha, unease, concern, hurly burly, upset, apprehensiveness, stew, disquietude, kerfuffle, mental disorder, fluster, hoo-hah, affray, anxiety, overturn, fear, solicitude, care, break, nervosity, dislocation, sweat, apprehension, psychological disorder, uneasiness, overthrow, gap, disruption, concernment, ruffle, turnover, interruption, anxiousness, interference, nervousness, worry, flutter, noise, swage, lather, folie, dither, fray, agita, to-do, mental disturbance, calm
aggravation (part of speech: noun)
exacerbation, provocation, irritation, harassment, aggravation, petulance, inflammation, exasperation, discomposure, bother, trouble, scorn, pique, virulence, arousal, disturbance, indignation, enragement, resentment, vexation, torment, bedevilment, annoyance, ire
disorder (part of speech: noun)
formlessness, anarchism, inchoateness, disconnectedness, dishevel, muddlement, lawlessness, inexactness, obscurity, amorphousness, unevenness, chaos, disarray, messiness, confusion, shapelessness, deformity, incoherence, looseness, anarchy, inconsistency, clutter, irregularity, disintegration, tumult, entropy, frenzy, disorderliness, mess, disorganization, insanity, derangement, indefiniteness, laxity, indistinctness, fuzziness
agitation (part of speech: noun)
- She rose in perturbation.
- My mind, during the few past days, seemed, as it were, disengaged from my body; but, now the struggle was over, I felt very forcibly the effect which perturbation of spirits produces on a woman in my situation. - "Maria The Wrongs of Woman", Mary Wollstonecraft.
- She dared not say so in their visitor's presence, but she wondered mightily at Phoebe's apparent perturbation. - "The Panchronicon", Harold Steele Mackaye.