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reluctant [reluctant 词源字典]: reluctant: [17] To be reluctant about doing something is etymologically to ‘struggle against’ it. The word comes from the present participle of Latin reluctārī, a compound verb formed from the prefix re- ‘against’ and luctārī ‘struggle’. Among the first English writers to employ it was John Milton, who used it in the literal Latin sense, describing the writhing Satan: ‘a monstrous serpent on his belly prone, reluctant, but in vain’, Paradise Lost 1667. ‘Unwilling, averse’, a metaphorical extension which saw the light of day in Latin, made its debut in English at the start of the 18th century.
[reluctant etymology, reluctant origin, 英语词源]
antagonism (n.): 1797, from French antagonisme or directly from late Greek antagonisma, noun of action from antagonizesthai "to struggle against" (see antagonist).
antagonist (n.): 1590s, from French antagoniste (16c.) or directly from Late Latin antagonista, from Greek antagonistes "competitor, opponent, rival," agent noun from antagonizesthai "to struggle against, oppose, be a rival," from anti- "against" (see anti-) + agonizesthai "to contend for a prize," from agon "contest" (see agony). Originally in battle or sport, extended 1620s to any sphere of human activity.
antagonize (v.): 1630s, "to compete with," from Greek antagonizesthai "to struggle against, oppose, be a rival" (see antagonist). Meaning "to struggle against continuously" is recorded from 1742. Related: Antagonized; antagonizing.
philosophy (n.): c. 1300, "knowledge, body of knowledge," from Old French filosofie "philosophy, knowledge" (12c., Modern French philosophie) and directly from Latin philosophia and from Greek philosophia "love of knowledge, pursuit of wisdom; systematic investigation," from philo- "loving" (see philo-) + sophia "knowledge, wisdom," from sophis "wise, learned;" of unknown origin.
Nec quicquam aliud est philosophia, si interpretari velis, praeter studium sapientiae; sapientia autem est rerum divinarum et humanarum causarumque quibus eae res continentur scientia. [Cicero, "De Officiis"]

[Philosophical problems] are, of course, not empirical problems; but they are solved through an insight into the workings of our language, and that in such a way that these workings are recognized -- despite an urge to misunderstand them. The problems are solved, not through the contribution of new knowledge, rather through the arrangement of things long familiar. Philosophy is a struggle against the bewitchment (Verhexung) of our understanding by the resources of our language. [Ludwig Wittgenstein, "Philosophical Investigations," 1953]
Meaning "system a person forms for conduct of life" is attested from 1771.
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.).