| libration(noun, evolution) |
| misgiving(noun, trouble, concern, delay, anxiety) |
| quiver(noun, beat, shudder, trembling, tremor) |
| resonance(noun, quiver, shudder, trembling, tremor) |
| sway(noun, action, act, movement, sign) |
| tremor(noun, shake, quiver, shudder, trembling) |
| uncertainty(noun, anxiety, weakness, doubt, shake) |
| doubt(noun, trouble, concern, delay, anxiety) |
| flap |
| flux(noun, action, act, movement, sign) |
| hesitation(noun, trouble, concern, delay, anxiety) |
| instability(noun, anxiety, weakness, uncertainty, shake) |
| motion(noun, action, movement, signal, wave) |
| periodicity(noun, recurrence, regularity of recurrence periodicity) |
| variation(noun, change, vacillation, interchange) |
| vibes |
| change(noun, action, act, movement, sign) |
| flicker(noun, spark, sparkle, glimmer) |
| intermittence |
| palpitation(noun, beat, shudder, tremor, throb) |