Etymology
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faint (adj.)

c. 1300, "enfeebled; wearied, exhausted," from Old French faint, feint "false, deceitful; sham, artificial; weak, faint, lazy, indolent, cowardly," past participle of feindre "hesitate, falter, be indolent, show weakness, avoid one's duty by pretending," from Latin fingere "to touch, handle; devise; fabricate, alter, change" (from PIE root *dheigh- "to form, build"). Also from c. 1300 as "deceitful; unreliable; false." Meaning "wanting in spirit or courage, cowardly" (a sense now mostly encountered in faint-hearted) is from early 14c. From early 15c. of actions, functions, colors, etc., "weak, feeble, poor." Meaning "producing a feeble impression upon the senses" is from 1650s.

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faint (v.)

c. 1300, "grow weak, become enfeebled," also "lack courage or spirit, be faint-hearted," and "to pretend, feign;" from faint (adj.). Sense of "swoon, lose consciousness" is from c. 1400. Also used in Middle English of the fading of colors, flowers, etc. Related: Fainted; fainting. For Chaucer and Shakespeare, also a transitive verb ("It faints me").

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faint (n.)

c. 1300, "faintness, faint-heartedness," from faint (adj.). From 1808 as "a swoon."

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faint-hearted (adj.)

"cowardly, timorous," c. 1400, from faint (adj.) + -hearted. Related: Faint-heartedly; faint-heartedness; faint-heart.

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faintness (n.)

early 14c., "feebleness, weariness," from faint (adj.) + -ness. Meaning "exhaustion" is mid-15c. Of color, light, etc., from 1640s.

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faintly (adv.)

c. 1300, "dispiritedly, timidly, half-heartedly;" early 14c. "feebly, wearily, without vigor;" from faint (adj.) + -ly (2). Meaning "indistinctly" is from 1580s. Also in Middle English, "deceitfully, hypocritically, falsely" (mid-14c.).

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feign (v.)

A 17c. respelling of fain, fein, from Middle English feinen, feynen "disguise or conceal (deceit, falsehood, one's real meaning); dissemble, make false pretenses, lie; pretend to be" (c. 1300), from Old French feindre "hesitate, falter; be indolent; lack courage; show weakness," also transitive, "to shape, fashion; depict, represent; feign, pretend; imitate" (12c.), from Latin fingere "to touch, handle; devise; fabricate, alter, change" (from PIE root *dheigh- "to form, build").

From late 14c. as "simulate (an action, an emotion, etc.)." Related: Feigned; feigning. The older spelling is that of faint, feint, but this word acquired a -g- in imitation of the French present participle stem feign- and the Latin verb.

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*dheigh- 

Proto-Indo-European root meaning "to form, build."

It forms all or part of: configure; dairy; dey (n.1) "female servant, housekeeper, maid;" disfigure; dough; effigy; faineant; faint; feign; feint; fictile; fiction; fictitious; figment; figure; figurine; lady; paradise; prefigure; thixotropy; transfigure.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dehah "body," literally "that which is formed," dih- "to besmear;" Greek teikhos "wall;" Latin fingere "to form, fashion," figura "a shape, form, figure;" Old Irish digen "firm, solid," originally "kneaded into a compact mass;" Gothic deigan "to smear," Old English dag, Gothic daigs "dough."

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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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