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1. (of a sight, smell, or sound) barely perceptible:

〖通例名詞の前で〗かすかな, ぼんやりした〈音･光･感情など〉

e.g. the faint murmur of voices.

(of a hope, chance, or possibility) slight; remote:

〖名詞の前で〗おぼろげな, ぼんやりした; わずかな〈考え･望み･機会など〉; ｟くだけて｠

e.g. there is a faint chance that the enemy may flee.

lacking in strength or enthusiasm; feeble:

〈体の機能などが〉弱った, 力ない

e.g. the faint beat of a butterfly's wing.

2. predicative weak and dizzy; close to losing consciousness:

〖be ～〗 【病気･疲れ･空腹などで】弱々しい, 気弱な; 気絶しそうな «with, from, for»

e.g. the heat made him feel faint.

verb no object

lose consciousness for a short time because of a temporarily insufficient supply of oxygen to the brain.

【空腹･痛み･暑さ･ショックなどで】気を失う, 卒倒する(away) «from, with»

archaic grow weak or feeble; decline:

｟古｠ 意気地がなくなる

e.g. the fires were fainting.

noun in singular

a sudden loss of consciousness:

〖通例a ～〗 気絶, 失神

e.g. she hit the floor in a dead faint.

informal have no idea:

e.g. I haven't the faintest what it means.

faintness |ˈfāntnis| noun

Middle English (in the sense ‘feigned’, also ‘feeble, cowardly’, surviving in faint heart): from Old French faint, past participle of faindre (see feign). Compare with feint1.