ill-defined 
adjective
Not having a clear description or limits; vague: ill-defined concepts...
- In the Collins Review it's presented as a vague and ill-defined feel-good motherhood concept.
- Scotland remains vague and ill-defined in the US consciousness.
- No, he favors a vague and ill-defined form of collective ownership that the workers will figure out as they bumble and stumble along towards bankruptcy.
Synonyms
vague, indistinct, unclear, imprecise, inexplicit;
blurry, blurred, fuzzy, hazy, woolly, nebulous, shadowy, dim
- silveriness
- silvering
- silver iodide
- silver jubilee
- silver Latin
- silver leaf
- silver-line
- silver maple
- silver medal
- silvern
- silver nitrate
- silver paper
- silver plate
- silverpoint
- silver salmon
- silver sand
- silver service
- silverside
- silversides
- silversmith
- silversmithing
- silver solder
- silver-spoon
- Silver Spring
- silver standard