| mystic |
| not understandable |
| on thin ice(expression, idiom, uncertain, nervous, worried) |
| prophetic |
| puzzling |
| questioning(uncertain, nervous, worried, hesitant, insecure) |
| shaky(uncertain, nervous, worried, hesitant, insecure) |
| sibylline(solid, dense, unfathomable, impenetrable, unintelligible) |
| troubled(uncertain, nervous, worried, hesitant, insecure) |
| unassured(uncertain, nervous, worried, hesitant, insecure) |
| unconfident(uncertain, nervous, worried, hesitant, insecure) |
| unfathomable(solid, dense, impenetrable, unintelligible, impassable) |
| ungraspable(solid, dense, unfathomable, impenetrable, unintelligible) |
| unintelligible(solid, dense, unfathomable, impenetrable, impassable) |
| unknowable(solid, dense, unfathomable, impenetrable, unintelligible) |
| unpoised(uncertain, nervous, worried, hesitant, insecure) |
| up in the air(expression, idiom, uncertain, nervous, worried) |
| uptight(uncertain, nervous, worried, hesitant, insecure) |
| abstruse(adjective, obscure, heavy, strange, serious) |
| abstract(adjective, heavy, serious, acute) |