· poorly stated or described; "he confuses the reader with ill-defined terms and concepts"
Synonym(s): ill-defined
· not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day"
Antonym(s): clear
· not easily deciphered; "indecipherable handwriting"
Synonym(s): indecipherable, undecipherable, unreadable