To lose consciousness temporarily due to a reduction of blood flow to the brain; to be on the verge of losing consciousness; lacking strength or vigor; dim, indistinct, or barely perceptible.
It can describe physical states, as well as qualities, like a Faint scent or sound, or abstract ideas like a Faint hope.
The core meaning centers around a temporary loss of awareness or a weakened presence. .
DIM WAN
PALE CONK WEAK
SWOON GIDDY MUTED TIMID VAGUE WISPY LIGHT
SUBTLE FEEBLE
PASSOUT SYNCOPE SHADOWY PASSOUT UNCLEAR
KEELOVER SWOONING
DELIQUIUM
INDISTINCT
LIGHTHEADED
FAINTHEARTED