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intransigent: intransigent: [19] In the 18th century there was an extreme leftist political party in Spain which, because of its unwillingness ever to compromise, was known as los intransigentes. The name was formed with the negative prefix in- from transigentes, the present participle of Spanish transigir ‘compromise’. This was a descendant of Latin transigere, literally ‘drive through’, hence ‘come to an understanding, accomplish’ (source of English transact), a compound verb formed from trans- ‘through’ and agere ‘drive’ (from which English gets action, agent, etc.) French took the Spanish word over as a general adjective meaning ‘uncompromising’, and English acquired it in the early 1880s.
=> act, action, agent, transact
intolerance (n.): "unwillingness to endure a differing opinion," 1765, from Latin intolerantia "impatience, unendurableness, insufferableness, insolence," from intolerantem (see intolerant). Especially of religious matters through mid-19c. Now-obsolete intolerancy was used in same sense from 1620s.
mum (interj.): "be silent," 1560s, from Middle English mum, mom (late 14c.), inarticulate closed-mouth sound, indicative of unwillingness or inability to speak. As an adjective meaning "secret" from 1520s. Phrase mum's the word is first recorded 1704.
reluctance (n.): 1640s, "act of struggling against," from obsolete verb reluct "to struggle or rebel against" (1520s), from Latin reluctari "to struggle against, resist, make opposition," from re- "against" (see re-) + luctari "to struggle, wrestle," perhaps shares a common origin with Greek lygos "pliant twig," lygizein "to bend, twist," Old English locc "twist of hair" (see lock (n.2)). Meaning "unwillingness" is first attested 1660s. Related: Reluctancy (1620s.).
unwilling (adj.): early 15c., altered from or re-formed to replace Middle English unwilland, from Old English unwillende; see un- (1) "not" + willing (adj.); see -ing (2). Related: Unwillingly; unwillingness.