Definitions of faint:

• noun:   a spontaneous loss of consciousness caused by insufficient blood to the brain
• verb:   pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain
• adjective:   barely perceptible; lacking clarity or brightness or loudness etc

  Example: "A faint outline"

• adjective:   lacking strength or vigor

  Example: "Damning with faint praise"

• adjective:   weak and likely to lose consciousness

  Example: "Suddenly felt faint from the pain"

• adjective:   lacking conviction or boldness or courage

  Example: "Faint heart ne'er won fair lady"

• adjective:   indistinctly understood or felt or perceived

  Example: "A faint clue to the origin of the mystery"

• adjective:   lacking clarity or distinctness

  Example: "Only a faint recollection"