| incomprehensible(adjective, unfathomable, understandable, impenetrable, unintelligible) |
| Greek(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| baffling(adjective, unfathomable, impenetrable, unintelligible) |
| beats me(expression, unfathomable, impenetrable, opaque, unintelligible) |
| clear as mud(expression, unfathomable, impenetrable, opaque, unintelligible) |
| cryptic(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| enigmatic(adjective, unfathomable, impenetrable, unintelligible) |
| fathomless(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| inconceivable(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| inscrutable(adjective, unfathomable, impenetrable, unintelligible) |
| mysterious(adjective, unfathomable, impenetrable, unintelligible) |
| mystifying(adjective, unfathomable, impenetrable, opaque, unintelligible) |
| not understandable(expression, unfathomable, impenetrable, opaque, unintelligible) |
| obscure(adjective, unfathomable, impenetrable, unintelligible) |
| opaque(unfathomable, impenetrable, unintelligible, puzzling) |
| perplexing(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| puzzling(adjective, unfathomable, impenetrable, opaque, unintelligible) |
| unclear(unfathomable, impenetrable, opaque, unintelligible, puzzling) |
| unfathomable(adjective, impenetrable, unintelligible) |
| unimaginable(unfathomable, impenetrable, opaque, unintelligible, puzzling) |