Synonyms for Unclear:

adj.

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

n.

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

Other synonyms:

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