Nouns

(n)faint, swoon, syncope, deliquiuma spontaneous loss of consciousness caused by insufficient blood to the brain

Verbs

(v)faint, conk, swoon, pass outpass out from weakness, physical or emotional distress due to a loss of blood supply to the brain

Adjectives

(s)faint, weakdeficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc“a faint outline”, “the wan sun cast faint shadows”, “the faint light of a distant candle”, “weak colors”, “a faint hissing sound”, “a faint aroma”, “a weak pulse”
(s)dim, faint, shadowy, vague, wispylacking clarity or distinctness“a dim figure in the distance”, “only a faint recollection”, “shadowy figures in the gloom”, “saw a vague outline of a building through the fog”, “a few wispy memories of childhood”
(s)faint, feeblelacking strength or vigor“damning with faint praise”, “faint resistance”, “feeble efforts”, “a feeble voice”
(s)faint, light, swooning, light-headed, lightheadedweak and likely to lose consciousness“suddenly felt faint from the pain”, “was sick and faint from hunger”, “felt light in the head”, “a swooning fit”, “light-headed with wine”, “light-headed from lack of sleep”
(s)faintindistinctly understood or felt or perceived“a faint clue to the origin of the mystery”, “haven't the faintest idea”
(s)faint, fainthearted, timid, faint-heartedlacking conviction or boldness or courage“faint heart ne'er won fair lady”