Etymology
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Words related to courage

*kerd- 
Proto-Indo-European root meaning "heart."

It forms all or part of: accord; cardiac; cardio-; concord; core; cordial; courage; credence; credible; credit; credo; credulous; creed; discord; grant; heart; incroyable; megalocardia; miscreant; myocardium; pericarditis; pericardium; quarry (n.1) "what is hunted;" record; recreant; tachycardia.

It is the hypothetical source of/evidence for its existence is provided by: Greek kardia, Latin cor, Armenian sirt, Old Irish cride, Welsh craidd, Hittite kir, Lithuanian širdis, Russian serdce, Old English heorte, German Herz, Gothic hairto, "heart;" Breton kreiz "middle;" Old Church Slavonic sreda "middle."
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courageous (adj.)
Origin and meaning of courageous

c. 1300, of persons, "valiant, brave, full of courage," also "desirous," from Anglo-French corageous, Old French corageus, corajos "eager, spirited, brave," also "capricious, inconstant" (12c., Modern French courageux), both on the notion of "following one's inner impulses," from corage "heart, innermost feelings; temper" (see courage). Of actions, speech, etc., "manifesting courage," by 1795. Related: Courageously; courageousness.

discourage (v.)

mid-15c., discoragen, "deprive of or cause to lose courage," from Old French descoragier "dishearten" (Modern French décourager), from des- "away" (see dis-) + coragier, from corage "spirit" (see courage). Meaning "express disapproval or opposition, dissuade or hinder from" is from 1640s. Related: Discouraged; discouragement; discouraging.

encourage (v.)
early 15c., from Old French encoragier "make strong, hearten," from en- "make, put in" (see en- (1)) + corage "courage, heart" (see courage). Related: Encouraged; encouraging; encouragingly.