"unclear" in the adjective sense
1. ill-defined, unclear
poorly stated or described
"he confuses the reader with ill-defined terms and concepts"
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
Source: WordNet® (An amazing lexical database of English)
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