inexplicit

ambiguous, cryptic, dark, enigmatic (also enigmatical), equivocal, murky, nebulous, obscure, unintelligible

bleary, blurry, dim, faint, foggy, gauzy, hazy, misty, woozy

indeterminate, indistinct, indistinguishable, uncertain, undefinable, undefined, undetermined

inexplicable, inscrutable, mysterious

baffling, bewildering, confounding, confusing, mystifying, obfuscatory, perplexing, puzzling, unfathomable