WordWeb Online

1. Poorly stated or described
   - ill-defined
    
2. Not clear to the mind
   "the law itself was unclear on that point"; "the reason for their actions is unclear to this day"
    
3. Not easily deciphered
   - indecipherable, undecipherable, unreadable

Derived forms: unclearer, unclearest

See also: ambiguous, blurred, clarity, clearness, clouded, confusing, illegible, incomprehensible, indefinite, indistinct, limpidity, lucidity, lucidness, obscure, opaque, pellucidity, perplexing, puzzling, unclearly, unclearness, uncomprehensible, vague

Antonym: clear