different between inconstancy vs facility

English

in- +? constancy or inconstant +? -cy

inconstancy (countable and uncountable, plural inconstancies)

From Middle French facilité, and its source, Latin facilit?s.

facility (countable and uncountable, plural facilities)

The fact of being easy, or easily done; absence of difficulty, simplicity. [from 16th c.]
Dexterity of speech or action; skill, talent. [from 16th c.]
The facility she shows in playing the violin is unrivalled.
The physical means or contrivances to make something (especially a public service) possible; the required equipment, infrastructure, location etc. [from 19th c.]
Transport facilities in Bangkok are not sufficient to prevent frequent traffic collapses during rush hour.
An institution specially designed for a specific purpose, such as incarceration, military use, or scientific experimentation.
(Canada, US, in the plural) A toilet. [from 20th c.]
(Scotland, law) A condition of mental weakness less than idiocy, but enough to make a person easily persuaded to do something against their better interest.
(dated) Affability.

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