| massive(adjective, hard, difficult, complex) |
| sensitive(adjective, hard, difficult, complex, painful) |
| stressful(adjective, hard, difficult, complex) |
| stringent(adjective, hard, tough, rough, firm) |
| ambitious(adjective, hard, ability, difficult, complex) |
| demanding(adjective, hard, tough, easy, rough) |
| intricate(adjective, hard, difficult, complex, awkward) |
| piercing(adjective, strong, cool, keen, sharp) |
| sad(adjective, hard, difficult, awful, terrible) |
| unbending(adjective, clear, strong, hard, tough) |
| critical(adjective, hard, tough, difficult, harsh) |
| knotted(adjective, hard, difficult, complex) |
| precarious(adjective, hard, difficult, complex, dangerous) |
| sheer(adjective, hard, difficult, harsh, pure) |
| stark(adjective, simple, attitude, plain, pure) |
| sticky(adjective, hard, difficult, complex, awkward) |
| unfeeling(adjective, person, mean, hard, tough) |
| heavyweight(adjective, hard, difficult, complex) |
| involved(adjective, hard, difficult, complex, awkward) |
| ponderous(adjective, hard, difficult, complex) |