| tiresome(adjective, dull, stupid, boring, routine) |
| umber(noun, adjective, dark, color, bay) |
| wearisome(adjective, dull, stupid, boring, routine) |
| bad(adjective, dull, sad, dark, common) |
| chocolate(adjective, dark, bay, buff, brown) |
| cinnamon(adjective, dark, bay, buff, brown) |
| cloudy(adjective, dull, soft, obscure, flat) |
| drear |
| dusky(adjective, dull, soft, obscure, lead) |
| ecru(noun, adjective, dark, color, bay) |
| frumpy(adjective, unfashionable, dowdy) |
| grimy(adjective, dull, soft, obscure, flat) |
| hazel(adjective, dark, bay, buff, brown) |
| hussy(noun, libertine) |
| indeterminate(adjective, pale, bland, monotonous, neutral) |
| lurid(adjective, dull, flat, dark, gloomy) |
| lusterless(adjective, dull, simple, flat, excite) |
| olive-drab |
| opaque(adjective, dull, soft, obscure, flat) |
| overcast(adjective, dull, soft, obscure, flat) |