nebulous

ambiguous, arcane, cryptic, dark, deep, Delphic, double-edged, elliptical ( elliptic), enigmatic ( enigmatical), equivocal, fuliginous, inscrutable, murky, mysterious, mystic, nebulous, occult, opaque

abstruse, esoteric, recondite; cloaked, concealed, disguised, masked, shrouded; beclouded, bedimmed, befogged, clouded, cloudy, dim, faint, foggy, fuzzy, hazy, indistinct, indistinguishable, misty, muddy, obfuscatory, obnubilated, obscurant ( obscurantic), shaded, shadowlike, shadowy, sphinxlike; indefinite, inexact, inexplicit, noncommittal, questionable, unclear, uncertain, undefined, undetermined, vague; impenetrable, incomprehensible, indecipherable, inexplicable; eerie ( eery), uncanny, weird; impalpable, inappreciable, intangible, invisible; unanswerable, unknowable; baffling, bewildering, confounding, confusing, mystifying, perplexing, puzzling, unfathomable; circuitous, indirect, roundabout; complex, complicated, difficult, obtuse

comprehensible, fathomable, intelligible, knowable, legible, pellucid, understandable; bright, distinct, evident, self-evident, self-explanatory; certain, firm, strong, sure; defined, determined; direct, straightforward; definite, exact, explicit; appreciable, palpable, tangible, visible; blatant, patent, unmistakable

blear, bleary, blurry, dim, foggy, fuzzy, gauzy, hazy, indefinite, indistinct, indistinguishable, misty, murky, nebulous, obscure, opaque, pale, shadowy, unclear, undefined, undetermined, vague

dark, dusky, gloomy; impalpable, inappreciable, intangible, invisible; hieroglyphic ( hieroglyphical), incomprehensible, indecipherable, indiscernible, inexplicable, mysterious, obfuscatory, puzzling

bright, distinct, evident, obvious, plain; certain, firm, strong, sure