| unmanageable(adjective, persistent, obstinate, insistent, dogged) |
| unregenerate(adjective, persistent, obstinate, insistent, dogged) |
| unstable(adjective, anxious, disturbed, fearful, distraught) |
| upset(adjective, anxious, disturbed, fearful, distraught) |
| uptight(adjective, anxious, disturbed, fearful, distraught) |
| violent(adjective, passionate, enthusiastic, ardent, fervent) |
| visionary(adjective, passionate, violent, enthusiastic, fervent) |
| wayward(adjective, persistent, obstinate, insistent, dogged) |
| willful(adjective, passionate, violent, enthusiastic, fervent) |
| wired(adjective, anxious, fearful, frantic, frenzied) |
| wrongheaded(adjective, persistent, obstinate, insistent, dogged) |
| adamant(adjective, persistent, obstinate, insistent, dogged) |
| addicting |
| addictive |
| admirer(noun, fanatic, enthusiast) |
| adoring(adjective, ardent, fervent, zealous, avid) |
| affecting(adjective, ardent, fervent, zealous, avid) |
| aficionado(noun, fanatic, enthusiast) |
| afire(adjective, keen, passionate, enthusiastic, fervent) |
| agitated(adjective, excited, nervous, restless) |