Synonyms for Clear as mud:

• adj.

  •equivocal (adjective)
  • clouded,
  • misleading,
  • hazy,
  • questionable,
  • unintelligible,
  • oblique,
  • suspect,
  • ambiguous,
  • unexplicit,
  • undecided,
  • indistinct,
  • indefinite,
  • puzzling,
  • indeterminate,
  • muzzy,
  • borderline,
  • evasive,
  • problematic,
  • disreputable,
  • tenebrous,
  • fuzzy,
  • suspicious,
  • Amphibological,
  • vague,
  • ambivalent,
  • dubious,
  • muddled,
  • unclear,
  • fishy,
  • with mixed feelings,
  • open.
  •incomprehensible (adjective)
  • greek,
  • unknowable,
  • beats me,
  • unimaginable,
  • mystifying,
  • impenetrable,
  • inconceivable,
  • fathomless,
  • over head,
  • baffling,
  • perplexing,
  • uncomprehensible,
  • mysterious,
  • inscrutable,
  • beyond grasp,
  • ungraspable,
  • sibylline,
  • beyond comprehension,
  • beyond one's grasp,
  • enigmatic,
  • over one's head,
  • cryptic,
  • delphic,
  • incognizable,
  • opaque.
  •obscure (adjective)
  • concealed,
  • recondite,
  • confusing,
  • hidden,
  • illegible,
  • enigmatical,
  • doubtful,
  • esoteric,
  • illogical,
  • insoluble,
  • far-out,
  • involved,
  • unbelievable,
  • abstruse,
  • complicated,
  • inexplicable,
  • dim,
  • occult,
  • unaccountable,
  • dark,
  • incredible,
  • intricate,
  • undefined,
  • indecisive,
  • arcane,
  • deep.
  •uncomprehensible (adjective)
  • un-comprehensible,
  • un comprehensible.
  •unfathomable (adjective)
  • heavy,
  • too deep,
  • indecipherable,
  • profound.

• Other synonyms:

  •Other relevant words:
  • die,
  • HASY,
  • DAPK,
  • amorphous,
  • fizzy,
  • misty,
  • Marky,
  • muddy.

Antonyms for Clear as mud:

• adj.

  • equivocal
    certain, definite, obvious, plain, unequivocal, unquestionable, determined, clear, sure.
  • incomprehensible
    comprehensible, understandable, believable, fathomable, imaginable, intelligible.
  • obscure
    bright, famous, distinguished, bare, public, common, visible, known, straightforward, apparent, exposed, perceptible, unmysterious, explicit, open, understood, uncovered.
  • unfathomable
    explicable, explainable.