| humdrum(adjective, dull, boring, tedious, dreary) |
| strenuous(adjective, dull, difficult, awkward, boring) |
| annoying(verb, adjective, dull, boring, tedious) |
| difficult(adjective, dull, difficult, awkward, boring) |
| jading(adjective, dull, boring, tedious, irritating) |
| tough(adjective, dull, difficult, boring, tired) |
| dry(adjective, weariness) |
| dulling(verb, boring) |
| enervating(adjective, dull, boring, dreary, trying) |
| flat(adjective, dull, boring, tedious, dreary) |
| grinding(adjective, tough, rough, difficult, heavy) |
| oppressive(adjective, dull, difficult, boring, tired) |
| soporific(adjective, dull, flat, boring, tedious) |
| trying(verb, adjective, dull, difficult, boring) |
| complicated(adjective, tough, rough, difficult, heavy) |
| demanding(adjective, dull, difficult, awkward, boring) |
| ho-hum(adjective, dull, boring, tired, tedious) |
| irksome(adjective, dull, difficult, awkward, boring) |
| knotty(adjective, tough, rough, difficult, heavy) |
| prosaic(adjective, dull, flat, boring, tedious) |