| grinding(adjective, difficult, harsh, pain, cruel) |
| callous(adjective, mean, cool, tough, severe) |
| adamant(adjective, mean, strong, tough, rough) |
| obdurate(adjective, mean, strong, cool, tough) |
| unfeeling(adjective, person, mean, cool, tough) |
| cold(adjective, person, mean, clear, cool) |
| grave(adjective, tough, severe, difficult, harsh) |
| hard-nosed(adjective, mean, strong, tough, severe) |
| serious(adjective, strong, tough, easy, severe) |
| sore(adjective, difficult, pain, complex, sickness) |
| sticky(adjective, difficult, complex, awkward, demanding) |
| hefty(adjective, person, dull, body, strong) |
| tricky(adjective, difficult, delicate, complex, awkward) |
| adamantine(adjective, characteristic, strong, strength, tough) |
| brutal(adjective, person, mean, tough, severe) |
| dire(adjective, difficult, tender, unpleasant, complex) |
| involved(adjective, difficult, complex, awkward, demanding) |
| massive(adjective, person, body, difficult, complex) |
| nasty(adjective, mean, cool, tough, severe) |
| profound(adjective, difficult, intense, complex, emotional) |