faint

Short definition from Wiktionary

Adjective

1. 1
   Lacking strength; weak; languid; inclined to lose consciousness
2. 2
   Lacking courage, spirit, or energy; cowardly; dejected.
3. 3
   Barely perceptible; not bright, or loud, or sharp.
4. 4
   Performed, done, or acted, weakly; not exhibiting vigor, strength, or energy.
5. 5
   Slight; minimal.
6. 6
   Sickly, so as to make a person feel faint.

Noun

1. 1
   The act of fainting, syncope.
2. 2
   The state of one who has fainted; a swoon.

Verb

1. 1
   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).
2. 2
   To lose courage or spirit; to become depressed or despondent.
3. 3
   To decay; to disappear; to vanish.