| poker-faced(adjective, callous, unexcitable, hard-as-nails) |
| prepared(adjective, hard, unfeeling, unsympathetic, hardened) |
| resistant(adjective, hard, unfeeling, unsympathetic, hardened) |
| seasoned(adjective, hard, unfeeling, unsympathetic, hardened) |
| secretive(unknowing, hermetical, unbriefed) |
| shrouded(unknowing, hermetical, unbriefed) |
| steeled(adjective, hard, unfeeling, unsympathetic, hardened) |
| stoical(adjective, callous, unexcitable, hard-as-nails) |
| unadvised(unknowing, hermetical, unbriefed) |
| unaffected by |
| unashamed(adjective, hard, unfeeling, unsympathetic, hardened) |
| unbriefed(unknowing, hermetical) |
| under-the-table(unknowing, hermetical, unbriefed) |
| under cover(expression, unknowing, hermetical, unbriefed) |
| under the table(expression, idiom, unknowing, hermetical, unbriefed) |
| unemotional(adjective, hard, unfeeling, unsympathetic, hardened) |
| unexcitable(adjective, callous, hard-as-nails) |
| unfamiliar(unaware, uninformed) |
| unforthcoming(unknowing, hermetical, unbriefed) |
| unimpressible(adjective, callous, unexcitable, hard-as-nails) |