Cynicism

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mid 16th century (in cynic (sense 2)): from Latin cynicus, from Greek kunikos ; probably originally from Kunosarges, the name of a gymnasium where Antisthenes taught, but popularly taken to mean ‘doglike, churlish’, kuōn, kun-, ‘dog’ becoming a nickname for a Cynic.

wiktionary

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From Cynicism, cynic +‎ -ism; compare cynism

etymonline

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cynicism (n.)

1670s, "philosophy or doctrines of the Cynics" (indifference to pleasure, stoicism pushed to austerity, asceticism), from cynic + -ism. Meaning "cynical character" is from 1847. For nuances of usage, see humor (n.).