Synonyms for Unclear:

adj.

darkish (adjective)
dim.
difficult (adjective)
involved.
not clear (adjective)
ambiguous, cloudy, confused, dim, fuzzy, hazy, nebulous, obscure, shadowy, uncertain, unsure, vague.
opaque (adjective)
dark, impenetrable, obscure, opaque, vague, cloudy, hazy, murky.
out of focus (adjective)
fuzzy.
semitransparent (adjective)
bleary, cloudy, diaphanous, filmy, foggy, fuzzy, gauzy, hazy, limpid, milky, misty, murky, semitransparent, veiled, semi-opalescent, semi-opaque.
unintelligible (adjective)
baffling, confusing, cryptic, enigmatic, illegible, incomprehensible, indecipherable, mysterious, mystifying, unreadable.

n.

ambiguous, certain, clear, complex, complicated, confused, contorted, difficult, elaborate, equivocal, incomprehensible, inexplicit, intricate, involved, nebulous, uncertain. borderline, chancy, doubtful, dubious, dubitable, iffy, inconclusive, indecisive, problematic, problematical, questionable, unsure. blear, dim, faint, indefinite, indistinct, shadowy, undistinct. unclear (noun)
bewildering, blurred, clouded, confusing, ill-defined, illegible, indecipherable, indeterminate, obscure, perplexing, puzzling, undecipherable, unreadable, vague.

Other synonyms:

chancy, dubitable, inexplicit, undistinct. ambiguous, confused, difficult, equivocal, iffy, inconclusive, indefinite, indistinct, nebulous, problematical, shadowy, unsure. indecisive, problematic, uncertain. borderline, questionable. dim. faint. ambiguous
doubtful.
vague
dubious.
Other relevant words:
ambiguous, bewildering, blear, blurred, borderline, chancy, clouded, confused, difficult, dim, doubtful, dubious, dubitable, equivocal, faint, iffy, ill-defined, incomprehensible, inconclusive, indecisive, indefinite, indeterminate, indistinct, inexplicit, nebulous, perplexing, problematic, problematical, puzzling, questionable, shadowy, uncertain, undecipherable, unsure, undistinct.

Usage examples for unclear

  1. For it is as false in experience and as unclear in thinking as could well be imagined. – Preaching and Paganism by Albert Parker Fitch
  2. Unclear or missing punctuation marks were corrected by reference to the 1854 edition of this work. – Christology of the Old Testament: And a Commentary on the Messianic Predictions, v. 1 by Ernst Wilhelm Hengstenberg
  3. When a writer finds himself skipping from idea to idea within a speech or a sentence, with transitions likely to be unclear for the audience, he should break what he has written into its component parts and let the other people on the stage, by their interruptions, queries, and comments, provide the connectives of speech and thought which will bind these ideas together properly. – Dramatic Technique by George Pierce Baker