| gruesome(dull, appearance, terrible, gloomy, miserable) |
| heartsick(sad, unhappy, sorrowful) |
| hideous(appearance, terrible) |
| horrible(dull, gloomy, miserable, wretched, distressing) |
| horrid(dull, appearance, terrible, gloomy, miserable) |
| ill-starred(adjective, bad, poor, unhappy, awkward) |
| impotent(adjective, weak, senseless, incompetent, unqualified) |
| impractical(stupid, unreasonable, idle, useless, trivial) |
| inefficacious(adjective, useless, vain, ineffective, unsuccessful) |
| inefficient(weak, useless, incompetent, unqualified, inept) |
| inexpert(useless, incompetent, unqualified, inept, clumsy) |
| infelicitous(adjective, bad, poor, awkward, inappropriate) |
| insoluble |
| insuperable |
| intolerable |
| inveterate(adjective, persistent, irredeemable) |
| irresponsible(adjective, unreliable, insecure, treacherous, incalculable) |
| lamentable(adjective, bad, poor, sad, unhappy) |
| lethal |
| low-spirited(low, dejected) |