| trepidation(dread, willies, nail-biting) |
| trepidity(dread, willies, nail-biting) |
| uncertainty(noun, unevenness, instability, shakiness, wobbliness) |
| unease(anxiety, dread, willies, nail-biting) |
| unevenness(noun, instability, shakiness, wobbliness) |
| unfixedness(noun, unevenness, instability, shakiness, wobbliness) |
| unpredictability(noun, unevenness, instability, shakiness, wobbliness) |
| unreliability(noun, unevenness, instability, shakiness, wobbliness) |
| unstableness(noun, unevenness, instability, shakiness, wobbliness) |
| unsteadiness(unevenness, instability, shakiness, wobbliness) |
| vacillation(noun, unevenness, instability, shakiness, wobbliness) |
| variability(noun, unevenness, instability, shakiness, wobbliness) |
| volatility(noun, unevenness, instability, shakiness, wobbliness) |
| vulnerability(noun, unevenness, instability, shakiness, wobbliness) |
| wavering(noun, unevenness, instability, shakiness, wobbliness) |
| weakness(noun, unevenness, instability, shakiness, wobbliness) |
| wingding(willies, butterflies, neurasthenia) |
| wobbliness(noun, unevenness, instability, shakiness) |
| worrier(excitability, tenseness) |
| worriment(anxiety, dread, willies, nail-biting) |