1. (

• ill-defined ,
• unclear ,

) poorly stated or described; "he confuses the reader with ill-defined terms and concepts" ;

2. (

• unclear

) not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day" ;

3. (

• indecipherable ,
• unclear ,
• undecipherable ,
• unreadable

) not easily deciphered; "indecipherable handwriting" ;