adj

• (of a being) Lacking strength; weak; languid; inclined to lose consciousness
  "I felt faint after my fifth gin and tonic."
• (archaic) Sickly, so as to make a person feel faint.
  "Happening to pass a fruiterer’s on their way; the door of which was open, though the shop was by this time shut; one of them remarked how faint the peaches smelled."

noun

• (rare) The state of one who has fainted; a swoon.

verb

• (intransitive) To lose consciousness through a lack of oxygen or nutrients to the brain, usually as a result of suddenly reduced blood flow (may be caused by emotional trauma, loss of blood or various medical conditions).
  "If I send them away fasting […] they will faint by the way."
• (intransitive) To lose courage or spirit; to become depressed or despondent.
  "If thou faint in the day of adversity, thy strength is small."
• (intransitive) To decay; to disappear; to vanish.
  "November 12, 1711, Alexander Pope, letter to Henry Cromwell Gilded clouds, while we gaze upon them, faint before the eye."