| immaterial(adjective, light, small, insignificant, inadequate) |
| impassive(adjective, dull, weak, easy, slow) |
| in a quandary(expression, adjective, idiom, uncertain, nervous) |
| inactive(adjective, dull, weak, easy, slow) |
| inappreciable(adjective, light, small, insignificant, inadequate) |
| incompetent(adjective, weak, thin, delicate, shaky) |
| inconsequent(adjective, light, small, insignificant, inadequate) |
| inconsiderable(adjective, insignificant, unimportant, trivial, minor) |
| indecisive(adjective, weak, thin, delicate, uncertain) |
| indeterminate(adjective, uncertain, nervous, doubtful, shaky) |
| indifferent(adjective, dull, weak, easy, slow) |
| ineffectual(adjective, weak, thin, delicate, shaky) |
| inefficient(adjective, weak, thin, delicate, shaky) |
| inert(adjective, dull, weak, easy, slow) |
| insecure(adjective, uncertain, nervous, doubtful, shaky) |
| insensible(adjective, indifferent, unconcerned, uncaring, passive) |
| insignificant(adjective, light, small, unimportant, trivial) |
| insipid(adjective, dull, weak, plain, mild) |
| insubstantial(adjective, weak, thin, delicate, shaky) |
| insufficient(adjective, light, weak, thin, delicate) |