| serious(adjective, hard, difficult, complex) |
| trying(adjective, hard, difficult, complex, painful) |
| weighty(adjective, hard, difficult, complex) |
| difficult(adjective, hard, complex) |
| grave(adjective, hard, difficult, complex) |
| punishing(adjective, hard, difficult, complex) |
| taxing(adjective, hard, difficult, complex) |
| tough(adjective, hard, difficult, complex) |
| insupportable(adjective, bad, pain, extreme, painful) |
| excruciating(adjective, severe, extreme, painful, endured) |
| unacceptable(adjective, bad, awful, terrible, endured) |
| agonizing(adjective, severe, awful, terrible, painful) |
| terrible(adjective, severe, unpleasant, awful, disgusting) |
| unsupportable(adjective, pain, endured) |
| awful(adjective, severe, unpleasant, terrible, disgusting) |
| harrowing(adjective, severe, awful, terrible, painful) |
| outrageous(adjective, bad, awful, terrible, shocking) |
| tormenting(adjective, severe, painful, endured, agonizing) |
| deplorable(adjective, shameful, unfortunate, endured) |
| dreadful(adjective, severe, unpleasant, awful, terrible) |