| incongruous(adjective, inadequate, useless, inappropriate, unhealthy) |
| incorrect(adjective, inadequate, useless, inappropriate, unhealthy) |
| ineffective(inadequate, inappropriate, unhealthy, unsuitable, second-rate) |
| inexact(deficient, broken, incomplete, warped, defective) |
| inexpedient(adjective, inadequate, useless, inappropriate, unhealthy) |
| infelicitous(adjective, inadequate, useless, inappropriate, unhealthy) |
| infra |
| inharmonious(adjective, inadequate, useless, inappropriate, unhealthy) |
| injured(deficient, broken, incomplete, inexact, warped) |
| insignificant(adjective, weak, poor, low, miserable) |
| insufficient(adjective, weak, poor, false, miserable) |
| invalid(adjective, ill, sick, unhealthy, unfit) |
| junk(inferior, deficient, incomplete, second-rate, inexact) |
| lackluster(weak, thin, ill, feeble, pale) |
| laid-low(weak, thin, ill, feeble, pale) |
| languid(weak, thin, ill, feeble, pale) |
| lemon(inferior, deficient, broken, incomplete, inexact) |
| less than average |
| low(weak, thin, incomplete, inexact, cranky) |
| low-grade(adjective, bad, weak, poor, nasty) |