| burdensome(adjective, dull, tough, difficult, awkward) |
| dreary |
| enervating(adjective, annoying, exhausting, verb, dull) |
| tough(adjective, dull, difficult, boring, grim) |
| humdrum(adjective, dull, stupid, boring, tedious) |
| onerous(adjective, dull, tough, difficult, awkward) |
| soporific |
| annoying(verb, adjective, dull, boring, tedious) |
| back-breaking |
| drudging(adjective, dull, stupid, boring, tedious) |
| irksome(adjective, dull, difficult, stupid, awkward) |
| jading(adjective, dull, boring, tedious, irritating) |
| trying(adjective, dull, hard, tough, boring) |
| debilitating(adjective, trying, exhausting, tiresome, wearisome) |
| dry |
| flat(adjective, dull, stupid, boring, tedious) |
| grueling(adjective, hard, tough, severe, difficult) |
| gruelling |
| merciless(adjective, tough, severe, rough, difficult) |
| prosaic(adjective, dull, flat, stupid, boring) |