Etymology
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pusillanimous (adj.)

early 15c., pusillanimus, "timid, lacking strength and firmness of mind," from Late Latin pusillanimis "having little courage" (used in Church Latin to translate Greek oligopsykhos "small-souled"), from Latin pusillis "very weak, little" (diminutive of pullus "young animal," from PIE root *pau- (1) "few, little") + animus "spirit, courage" (see animus). Related: Pusillanimously; pusillanimousness.

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pusillanimity (n.)

late 14c., pusillanimite, "timidity, faint-heartedness, lack of the spirit of courage or fortitude," from Old French pusillanimité (14c.) and directly from Church Latin pusillanimitatem (nominative pusillanimitas) "faint-heartedness," from Latin pusillanimis "faint-hearted, having little courage" (see pusillanimous).

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*ane- 
Proto-Indo-European root meaning "to breathe."

It forms all or part of: anemo-; anemometer; anemone; anima; animadversion; animadvert; animal; animalcule; animalistic; animate; animation; animatronic; anime; animism; animosity; animus; Enid; equanimity; longanimity; magnanimous; pusillanimous; unanimous.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit aniti "breathes;" Greek anemos "wind;" Latin animus "rational soul, mind, life, mental powers, consciousness, sensibility; courage, desire," anima "living being, soul, mind, disposition, passion, courage, anger, spirit, feeling;" Old Irish anal, Welsh anadl "breath," Old Irish animm "soul;" Gothic uzanan "to exhale," Old Norse anda "to breathe," Old English eðian "to breathe;" Old Church Slavonic vonja "smell, breath;" Armenian anjn "soul."
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*pau- (1)

Proto-Indo-European root meaning "few, little."

It forms all or part of: catchpoll; encyclopedia; filly; foal; few; hypnopedia; impoverish; orthopedic; Paedophryne; paraffin; parvi-; parvovirus; paucity; Paul; pauper; pedagogue; pederasty; pedo-; pedophilia; poco; poltroon; pony; pool (n.2) "game similar to billiards;" poor; poulterer; poultry; poverty; puericulture; puerile; puerility; puerperal; pullet; pullulate; Punch; Punchinello; pupa; pupil (n.1) "student;" pupil (n.2) "center of the eye;" puppet; pusillanimous; putti.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit potah "a young animal," putrah "son;" Avestan puthra- "son, child;" Greek pauros "few, little," pais (genitive paidos) "child," pōlos "foal;" Latin paucus "few, little," paullus "little," parvus "little, small," pauper "poor," puer "child, boy," pullus "young animal;" Oscan puklu "child;" Old English feawe "not many, a small number," fola "young horse;" Old Norse fylja "young female horse;" Old Church Slavonic puta "bird;" Lithuanian putytis "young animal, young bird;" Albanian pele "mare."

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infirm (adj.)

late 14c., "weak, unsound" (of things), from Latin infirmus "weak, frail, feeble, not strong or firm" (figuratively "superstitious, pusillanimous, inconstant"), from in- "not, opposite of" (see in- (1)) + firmus "strong; stable," figuratively "constant, trusty" (from suffixed form of PIE root *dher- "to hold firmly, support" ). Of persons, "not strong, unhealthy," first recorded c. 1600. As a noun from 1711.

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