nebulous
Meaning: Unclear and lacking form
Sentence:She has a few nebulous ideas about what she might like to do in the future, but nothing definite.


Synonyms
1)Ambiguous
His reply to my question was somewhat ambiguous

2)hazy
hazy memories of childhood.
She only hazily (= unclearly) remembered her last visit twenty years ago


3)imprecise
The figures are imprecise because they're based on a prediction of next year's sales.

4)indefinite
The project has been postponed for an indefinite period.


5)indeterminate
An indeterminate number of workers have already been exposed to the danger.
a man of indeterminate age


6)Indistinct
an indistinct shape/sound/recollection


7)murky
The river was brown and murky after the storm

8)Vague
I do have a vague memory of meeting her many years ago.
Through the mist I could just make out a vague figure.
Their report is studiously vague (= intentionally not exact) on future economic prospects.


Antonyms
1)well-defined
Meaning:clearly expressed
We were not expecting Mr Levy to give us a clear or well-defined answer.
Scientists follow several well-defined steps in investigating unexpected outbreaks of disease.


2)Clear
Can we make the sound any clearer?
These books have lovely clear print.
Our new television has a very clear picture.