Main entry: unclear
Definition: not clear to the mind
Usage: the law itself was unclear on that point; the reason for their actions is unclear to this day
Antonyms: clear
Definition: readily apparent to the mind
Main entry: unclear, ill-defined
Definition: poorly stated or described
Usage: he confuses the reader with ill-defined terms and concepts
Antonyms: clear, well-defined
Definition: accurately stated or described
Main entry: indecipherable, unreadable, unclear, undecipherable
Definition: not easily deciphered
Usage: indecipherable handwriting
Antonyms: legible
Definition: (of handwriting, print, etc.) capable of being read or deciphered