unclear -
not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day"
clear readily apparent to the mind; "a clear and present danger"; "a clear explanation"; "a clear case of murder"; "a clear indication that she was angry"; "gave us a clear idea of human nature"
ambiguous having more than one possible meaning; "ambiguous words"; "frustrated by ambiguous instructions, the parents were unable to assemble the toy"
indefinite not decided or not known; "were indefinite about their plans"; "plans are indefinite"
uncomprehensible,
incomprehensible difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein
indistinct not clearly defined or easy to perceive or understand; "indistinct shapes in the gloom"; "an indistinct memory"; "only indistinct notions of what to do"
opaque not transmitting or reflecting light or radiant energy; impenetrable to sight; "opaque windows of the jail"; "opaque to X-rays"
blurred,
clouded unclear in form or expression; "the blurred aims of the group"; "sometimes one understood clearly and sometimes the meaning was clouded"- H.G.Wells
perplexing,
confusing,
puzzling lacking clarity of meaning; causing confusion or perplexity; "sent confusing signals to Iraq"; "perplexing to someone who knew nothing about it"; "a puzzling statement"
unclear -
poorly stated or described; "he confuses the reader with ill-defined terms and concepts"
