| doubtful(noun, adjective, tricky, sticky, challenging) |
| enigmatic(adjective, hard, obscure, dark, strange) |
| forbidding |
| fractious(adjective, tough, irritable, obstinate, stubborn) |
| hurtful(adjective, sickness, ache, anguishes) |
| hurting(adjective, sickness, ache, anguishes) |
| impolite(adjective, tough, problematic, trying, perverse) |
| incomprehensible(adjective, obscure, dark, strange, uncertain) |
| inflamed(adjective, sickness, ache, anguishes) |
| insoluble(adjective, tough, wild, strange, awkward) |
| laboured |
| miserable(adjective, adverse) |
| no picnic(expression, adjective, hard, tough, rough) |
| obstreperous(adjective, tough, irritable, problematic, trying) |
| persnickety(adjective, harsh, rigid, strict, particular) |
| piercing(adjective, sickness, ache, anguishes) |
| punctilious(adjective, demanding, particular, meticulous, fussy) |
| raw(adjective, sickness, ache, anguishes) |
| rebellious(adjective, disobedient, unmanageable) |
| saddening(adjective, sickness, ache, anguishes) |