0 (especially of ideas) not clear and having no form:
1 (esp. of ideas) unclear and lacking form; vague:
a nebulous concept
How could anything so infuriatingly nebulous possibly elucidate egoism or altruism?
Beyond these guidelines, the situation was essentially nebulous.
The structural approach is avoided since the socio-economic situation has not markedly improved since 2001 and culture is a rather nebulous concept to measure.
Suddenly the act of sitting floats into a nebulous network of underground spaces.
Such adjectives as too dark, or too nebulous do not help.
However, the incorporation of the past in social life is nebulous, inferred rather than examined, let alone understood.
Suffice it to say that, particularly initially, many remained "nebulous" because the relationship was "crazy".
Qualitative research methods are often more appropriate to the frequently nebulous areas that primary care research must address.
