different between vagary vs fickleness

English

From Latin vagus (“wandering”).

vagary (plural vagaries)

An erratic, unpredictable occurrence or action.
- 1871, Charles Kingsley, At Last: A Christmas In The West Indies, ch. 8:
  It now turns out that the Pitch Lake, like most other things, owes its appearance on the surface to no convulsion or vagary at all, but to a most slow, orderly, and respectable process of nature, by which buried vegetable matter, which would have become peat, and finally brown coal, in a temperate climate, becomes, under the hot tropic soil, asphalt and oil.
An impulsive or illogical desire; a caprice or whim.
Synonyms: see Thesaurus:whim
- 1905, Jack London, War of the Classes, Preface:
  And then came the day when my socialism grew respectable,—still a vagary of youth, it was held, but romantically respectable.

From Middle English fikelnesse, equivalent to fickle +? -ness.

fickleness (countable and uncountable, plural ficklenesses)

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