| difficult(adjective, characteristic, difficulty, burden, problem) |
| demanding(adjective, characteristic, difficulty, burden, problem) |
| exacting(adjective, characteristic, difficulty, burden, problem) |
| timidity |
| troublesome(adjective, characteristic, difficulty, burden, problem) |
| trying(adjective, characteristic, difficulty, burden, problem) |
| perplexing(adjective, characteristic, difficulty, hardship, complication) |
| arduous(adjective, characteristic, difficulty, hardship, complication) |
| burdensome(adjective, characteristic, difficulty, burden, problem) |
| challenging(adjective, characteristic, difficulty, hardship, complication) |
| delicate(adjective, characteristic, difficulty, hardship, complication) |
| formidable(adjective, characteristic, difficulty, hardship, complication) |
| hard(adjective, characteristic, difficulty, hardship, complication) |
| heavy(adjective, characteristic, difficulty, burden, problem) |
| onerous(adjective, characteristic, difficulty, burden, problem) |
| painful(adjective, characteristic, difficulty, hardship, complication) |
| severe(adjective, characteristic, difficulty, hardship, complication) |
| strenuous(adjective, characteristic, difficulty, hardship, complication) |
| thorny(adjective, characteristic, difficulty, hardship, complication) |
| ticklish(adjective, characteristic, difficulty, hardship, complication) |