a dim figure in the distance.
a few wispy memories of childhood.
a vague uneasiness.
an impulse to go off and fight certain obscure battles of his own spirit.
an obscure turn of phrase.
an undefined term.
only a faint recollection.
saw a vague outline of a building through the fog.
shadowy figures in the gloom.
some undefined sense of excitement.
their descriptions of human behavior become vague, dull, and unclear.
undefined authority.
vague feelings of sadness.
vague...forms of speech...have so long passed for mysteries of science.