| iffy(adjective, uncertain, nervous, doubtful, hesitant) |
| impervious to persuasion(expression, idiom) |
| improbable(uncertain, doubtful, unsure) |
| in a quandary(expression, adjective, idiom, uncertain, nervous) |
| in clouds(expression, uncertain, hesitant, dubious, unsure) |
| in dilemma(expression, uncertain, hesitant, dubious, unsure) |
| in the know(expression, idiom, refined, practical, mature) |
| incalculable |
| indemonstrable |
| indeterminate(adjective, uncertain, nervous, doubtful, shaky) |
| indisposed |
| infidel |
| inquisitive |
| into(adjective, cool, refined, practical, mature) |
| jaded(adjective, refined, practical, mature, cultured) |
| jet-set(adjective, refined, practical, mature, cultured) |
| knowing(refined, practical, cultured, urbane, erudite) |
| lacking(adjective, uncertain, nervous, doubtful, shaky) |
| lacking confidence(expression, adjective, uncertain, shy, doubtful) |
| laid-back(adjective, refined, practical, mature, cultured) |