| impaired(mean, weak, down, sick, feeble) |
| imperfect(mean, weak, down, ill, sick) |
| in a bad way(expression, idiom, mean, weak, green) |
| in poor health(expression, idiom, mean, sick, green) |
| inborn(fixed, persistent, continuous, lasting, continuing) |
| inbred(fixed, persistent, continuous, hardened, lasting) |
| incompliant(tough, difficult, wild, awkward, obstinate) |
| incurability |
| incurableness |
| incurably |
| indisposed(mean, weak, ill, sick, green) |
| indocile(tough, difficult, wild, awkward, obstinate) |
| indomitable(tough, difficult, wild, awkward, obstinate) |
| infected(mean, weak, down, sick, feeble) |
| infirm(mean, weak, down, sick, feeble) |
| ingrained(adjective, fixed, persistent, continuous, hardened) |
| inpatient |
| insoluble(tough, difficult, wild, awkward, obstinate) |
| irreplaceable |
| laid-up(adjective, mean, weak, down, sick) |