| mysterious(adjective, obscure, dark, uncertain, incomprehensible) |
| incomprehensible(adjective, dark, uncertain, deep, mysterious) |
| unclear(adjective, unintelligible) |
| unreadable(adjective, incoherent, unfathomable, incomprehensible, enigmatic) |
| illegible(adjective, small, restricted, incomprehensible, unintelligible) |
| undecipherable(adjective, illegible) |
| enigmatic(adjective, deep, mysterious, unfathomable, profound) |
| puzzling(adjective, dark, uncertain, mysterious, illegible) |
| cryptic(adjective, dark, uncertain, mysterious, unintelligible) |
| obscure(adjective, dark, uncertain, deep, mysterious) |
| occult(adjective, dark, uncertain, mysterious) |
| unfathomable(adjective, hard, obscure, difficult, dark) |
| unintelligible(adjective, dark, uncertain, deep, mysterious) |
| baffling(adjective, unintelligible) |
| inexplicable(adjective, obscure, dark, uncertain, deep) |
| inscrutable(adjective, dark, uncertain, mysterious, unfathomable) |
| mystifying(adjective, unintelligible) |
| arcane(adjective, unfathomable, incomprehensible, enigmatic, sphinx-like) |
| impenetrable(adjective, obscure, deep, mysterious, incoherent) |
| enigmatical(adjective, unintelligibility) |