a. 不清楚的, 朦胧的, 难以清楚辨认的

[ adj ]
not clearly defined or easy to perceive or understand
<adj.all>
indistinct shapes in the glooman indistinct memory
only indistinct notions of what to do

Indistinct \In`dis*tinct"\ ([i^]n`d[i^]s*t[i^][ng]kt"), a. [L.
indistinctus: cf. F. indistinct. See {In-} not, and
{Distinct}.]
1. Not distinct or distinguishable; not separate in such a
manner as to be perceptible by itself; as, the indistinct
parts of a substance. ``Indistinct as water is in water.''
--Shak.

2. Obscure to the mind or senses; not clear; not definite;
confused; imperfect; faint; as, indistinct vision; an
indistinct sound; an indistinct idea or recollection.

When we come to parts too small four our senses, our
ideas of these little bodies become obscure and
indistinct. --I. Watts.

Their views, indeed, are indistinct and dim.
--Cowper.

Syn: Undefined; indistinguishable; obscure; indefinite;
vague; ambiguous; uncertain; confused.