(a.) Incapable of being read; indecipherable; not legible; as, illegible handwriting; an illegible inscription\.

aleatoric aleatory alike ambiguous amorphous barely audible blear bleared bleary blind blobby blurred blurry breathy broad chance chancy chaotic choked choking clear as mud cloudy confused croaking dark decrescendo dim disordered distant drawling drawly dysphonic equivocal faint faint-voiced feeble filmy foggy fuzzy general gentle guttural half-heard half-seen half-visible harsh hawking hazy hit-or-miss hoarse ill-defined illegible imprecise inaccurate inarticulate inchoate incoherent inconspicuous indecisive indefinable indefinite indeterminable indeterminate indiscernible indistinctive indistinguishable inexact inseparable interchangeable lax lisping loose low low-profile merely glimpsed mispronounced misty muddy muffled murky murmured muzzy nasal nebulous nonspecific obscure opaque orderless out of focus pale pianissimo piano quavering random scarcely heard semivisible shadowed forth shadowy shaking shaky shapeless snuffling soft soft-sounding soft-voiced standard stereotyped stifled stochastic strangled subaudible subdued sweeping thick throaty transcendent tremulous twangy uncertain unclear undefined undestined undetermined undifferentiated undiscriminated undistinguishable undistinguished uniform unintelligible unplain unrecognizable unspecified vague veiled velar weak weak-voiced whispered without distinction