| impending(warning, threatening, unfavorable, ominous, worrying) |
| implausible |
| improper(adjective, negative, inadequate, hostile, useless) |
| inapplicable(adjective, inadequate, useless, inappropriate, unhealthy) |
| inappropriate(adjective, inadequate, useless, unhealthy, unsuitable) |
| incompatible(adjective, inadequate, useless, inappropriate, unhealthy) |
| incongruous(adjective, inadequate, useless, inappropriate, unhealthy) |
| incorrect(adjective, inadequate, useless, inappropriate, unhealthy) |
| incredible |
| ineffective(inadequate, useless, inappropriate, unhealthy, unsuitable) |
| inexpedient(adjective, negative, inadequate, hostile, useless) |
| infelicitous(adjective, negative, inadequate, hostile, useless) |
| infertile(adjective, poor, small, insignificant, unimportant) |
| inharmonious(adjective, inadequate, useless, inappropriate, unhealthy) |
| inimical(negative, disapproving, uncomplimentary) |
| insufficient(adjective, poor, small, insignificant, unimportant) |
| jejune(adjective, poor, small, insignificant, unimportant) |
| lacking(adjective, poor, small, insignificant, unimportant) |
| laid low(expression, adjective, inadequate, useless, inappropriate) |
| lamentable(adjective, poor, small, insignificant, unimportant) |