nebulous

英['nebjʊləs] 美['nɛbjələs]

1. lacking definite form or limits;

"gropes among cloudy issues toward a feeble conclusion"- H.T.Moore

"nebulous distinction between pride and conceit"

2. lacking definition or definite content;

"nebulous reasons"

"unfixed as were her general notions of what men ought to be"- Jane Austen