faint

Weak and likely to lose consciousness.

“suddenly felt faint from the pain”

“was sick and faint from hunger”

Deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc.

“a faint outline”

“the wan sun cast faint shadows”

Lacking conviction or boldness or courage.

“faint heart ne'er won fair lady”

Lacking strength or vigor.

“damning with faint praise”

“faint resistance”

Lacking clarity or distinctness.

“only a faint recollection”

Indistinctly understood or felt or perceived.

“a faint clue to the origin of the mystery”

“haven't the faintest idea”

Pass out from weakness, physical or emotional distress due to a loss of blood supply to the brain.

A spontaneous loss of consciousness caused by insufficient blood to the brain.