| mercurial(adjective, change, continue, difficult, delicate) |
| parlous(adjective, dangerous) |
| slippery(adjective, weak, delicate, uncertainty, uncertain) |
| sore |
| unpredictable(noun, adjective, upset, change, continue) |
| unsure(noun, adjective, delicate, uncertain, unstable) |
| variable(adjective, upset, change, continue, difficult) |
| arduous(adjective, difficult) |
| changeable(adjective, upset, change, weak, continue) |
| formidable(adjective, bad, hard, tough, difficult) |
| fragile |
| laborious(adjective, difficult) |
| painful(sensitive, tricky, problematic, embarrassing) |
| problematic(adjective, tough, difficult, delicate, uncertain) |
| rugged(adjective, difficult, delicate, uncertain, unstable) |
| severe(adjective, difficult) |
| shaky(adjective, upset, delicate, uncertain, anxious) |
| toilsome(adjective, difficult) |
| tough(adjective, difficult) |
| treacherous(adjective, delicate, uncertain, unreliable, unsound) |