| indecisive(open, uncertain, doubtful, unsettled, vague) |
| indeterminate(adjective, uncertain, nervous, doubtful, shaky) |
| indifferent |
| inner(mean, middle, inside, central, internal) |
| insecure(adjective, uncertain, nervous, doubtful, shaky) |
| inside(mean, middle, central, internal, halfway) |
| insipid |
| intermediate(mean, middle, central, internal, halfway) |
| intervening(mean, middle, central, internal, halfway) |
| irresolute(open, uncertain, nervous, doubtful, unsettled) |
| lacking(adjective, uncertain, nervous, doubtful, shaky) |
| lackluster |
| mainstream(mean, middle, inside, central, internal) |
| mean(center, middle, central, internal, halfway) |
| medial(mean, middle, central, internal, halfway) |
| medially |
| median(mean, middle, central, internal, halfway) |
| mediocre |
| mediumly |
| mezzo(mean, middle, inside, central, internal) |