| inexpert(adjective, weak, inadequate, feeble, unfit) |
| inferior(adjective, weak, inadequate, limited, feeble) |
| innocent(simple, gentle, inoffensive, innocuous) |
| innocuous(simple, gentle, inadequate, limited, feeble) |
| innoxious(simple, gentle, innocent, inoffensive, innocuous) |
| inoffensive(simple, gentle, innocent, innocuous) |
| inproficient(adjective, weak, inadequate, unfit, unqualified) |
| insubstantial(adjective, weak, thin, delicate, uncertain) |
| insufficient(adjective, weak, thin, delicate, inadequate) |
| laid-up(hurt, weakened, infirm, injured, debilitated) |
| lightweight |
| like a clay pigeon(expression, adjective, idiom, vulnerable, exposed) |
| like a sitting duck(expression, adjective, idiom, vulnerable, insecure) |
| limber |
| limited(inadequate, feeble, useless, vain, unsuccessful) |
| listless |
| losing(adjective, weak, inadequate, unfit, unqualified) |
| low-powered |
| lustless |
| maimed(hurt, weakened, infirm, injured, debilitated) |