| fly-by-night(adjective, unreliable, insecure, treacherous, incalculable) |
| free |
| frightened(adjective, upset, uncertain, nervous, unstable) |
| hairy(adjective, bad, delicate, uncertain, unstable) |
| have cold feet(expression, idiom, upset, uncertain, anxious) |
| hung up(expression, adjective, upset, excited, uncertain) |
| hyper(upset, excited, anxious, nervous, careful) |
| ill(adjective, weak, delicate, false, unstable) |
| implausible(adjective, likely) |
| improbable(adjective, likely, unlikely, unpromising) |
| in a cold sweat(expression, idiom, upset, uncertain, anxious) |
| in a dither(expression, adjective, idiom, uncertain, anxious) |
| in a sweat(expression, adjective, idiom, upset, uncertain) |
| in a tizzy(expression, adjective, idiom, upset, excited) |
| inconstant(unreliable, uneven, variable, unbalanced, erratic) |
| incredible(adjective, thin, doubtful, dubious, suspicious) |
| indistinct(unlikely, unpromising) |
| invalid(ill, sick, unhealthy, frail, unfit) |
| irregular(adjective, dubious, uneven, suspect, variable) |
| jellyfish(adjective, upset, uncertain, anxious, nervous) |